六年级解方程专项练习200题(有答案)

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六年级解方程专项练习200题(有答案)


(1)x﹣=,




(2) x××=,





(3) ﹣4x=,





(4) 8×2.5﹣2x=13.6





(5) 0.78:x=3:5,






(6)1﹣20%x=0.4,





(8) 1÷(x﹣)=6,






(9)2x﹣x=1.2,




(10)9×3﹣1.7x=13.4,






(11)x﹣25%x=24,





(12)x﹣+0.2=,





(13)0.6x+90%x=78,






(14)20%x﹣2.4×3=0.8,





(15)x﹣x=42,





1
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(16)0.6x+3×2.5=67.5,





(17)1÷(x﹣0.45)=5,





(18)x﹣2.25=8.25,





(19):x=3:12,





(20)x+0.8=5.6,





(21) 1.4:x=1:0.75,






(22) x×(2﹣)=24,







(23) 4x﹣=3,





(24)12x+7×0.3=20.1,





(25)x+x=,





(26)x:42=,





(27)×0.5+x=,





(28)0.8:=0.48:x,




(29)χ﹣χ=,







2
页 共 28 页



(30)42:=χ:





(31)5x﹣0.4=75%,





( 32) 6x﹣0.9=4.5,





(33)2(x﹣3)=5.8,




(34) 1.6x=6.4,




(35) 4x﹣3×9=29,




(36)16+8x=40,





(37) x÷1.1=3,




(38)+2x=,



(39)×3﹣7x=1.04,




(40)x﹣1﹣x=2,




(41)x﹣x=14,




(42)3x﹣x=,




(43)=,




(44)1.2:=,




(45)=:,




(46):=x:0.8,





3
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(47)x=+1,




(48)1﹣25%X+25%x=+25%x,




=,
(49)





×X=,
(50)





(51) 5:8=x:32,





(52)2x+3×0.9=24.9,





(53)5.3x﹣2.9x=,




(54)×(7﹣2.8x)=1.5,



(55)x:0.3=:,





(56)150%x+66=99





(57)x+6﹣0.8x=16






(58)






(59)




(60)3÷(X﹣)=1.3





(61)(X+0.5):2=(X﹣4):,




(62) X÷0.05=3.528,




4
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(63)2X﹣4×6=80,




(64)4×4.5﹣3X=6.38,




(65)4X﹣7.2=10,




(66)11.5X+X=20,




(67)3.8×12+15X=87.6,




(68)6X+5=17,




(69)0.6×(2.5+X)=4.2,





(70):=X:,




(71),





(72)




(73),




(74)4(+x)=,




(75)×0.25+x=,




(76)x﹣,




(77)200:6=x:,




(78)4÷X=,




(79)8(x﹣2)=2(x+7),






5
页 共 28 页





(80):18%=,





﹣2x=,
(81)





x+x=46,
(82)





(83):x=:,




(84)=,




(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)





(86)=,




(87)8(2X﹣7)=5(X+13),




(88)3(x+4.5)=60,





(89)1.6x+2.4=7.52,






(90)3(x﹣0.8)=6.3,





(91)28.4﹣5x=5.8,





(92)x:=






(93)+2x=,





(94)x=15%,



(95)x﹣x=,




6
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(96)x+50%x=6,




(97):x=0.3:12,




(98)4x+2(8﹣x)=26,





(99)x﹣=0,




(100)+x=1,





(101)x×(+)=,




(102),




(103),





(104)x﹣,




(105)x×,





(106)5x+35=650,





(107)720÷3x=80,





(108)3.6x﹣0.9x=8.1,





(109)4×4.5﹣3x=6,





(110)=,





(111)6×3﹣1.8X=7.2,




7
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(112)÷x=,




(113)x÷=42,




(114)x+=,




(115)7x÷3=8.19,




(116)12:0.6=x:,




(117)3(x+2)=4(x+1),





(118)3x﹣70%x=9.2,





(119) 6+x=240,







(120)22.5﹣0.4x=12.5,




(121)x:3.5=4:2,





(122)x﹣0.8x﹣6=16,




(123):=x:8,




(124),




(125)x:15=:,




(126)x+x=,




(127)x×50%﹣x=5,






8
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(128)1﹣x=,




(129)2.5+1x=3,




(130)3x﹣2=4,




(131)8.5﹣3x=2,




(132)3÷x=4,




(133)x﹣5%=17.54,





(134):=:(4﹣x),





(135) 6x+31=49,





(136) 7x÷3=8.19,





(137) 32.8﹣9x=17.5,





(138) x﹣0.36x=16,





(139) 6×7+3x=69,





(140) 6x+2x﹣56=0,






(141) 3x﹣0.45×4=2.7,





(142) 5.8x﹣4.6x=0.96,





(143) 8.4÷(9﹣x)=3,






9
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(144) 3x÷1.2=8,




(145)5x+28=71,




(146)8.7﹣1.2x=3.9,




(147)8x﹣2.6x=37.8,




(148)0.75x﹣0.95×4=8.5,




(149)54÷2+3x=72,





(150)8x﹣2.6=37.8,




(151)x÷=,




(152)x+30%x=26,







(153) 7.8﹣3x=3.6,




(154) 6×3﹣1.8x=7.2,




(155)10:x=4.5:0.8,




(156):=x:,




(157)X﹣7.65=4.64,




(158)28.25﹣X=8.25,




(159)X﹣(3.6+2.97)=12.42,





(160)÷x=,




(161)14.5=5.5,





10
页 共 28 页





(162)x﹣80%x=48,




(163)75%x﹣5×=6,




(164)x﹣6.8=15.4,





(165)1.9x=5.7,




(166)4.3y﹣y=4.6,




(167)5x+2.6=7.6,




(168) x﹣1.5=12.9,





(169) 9x+5x=8.4,




(170) 6.8+3.2x=14.8,





(171)5÷x=,




(172)﹣x=,




(173)4.5×﹣3x=1.5,




(174)(1+25%)x=0.5,





(175)x﹣40%x=9,





(176)x×20%=15.2,





(178)x﹣x=,





(179)x÷75%=3,




11
页 共 28 页




(180)4x﹣,




(181):x=:4.5,




(182)(x﹣4.5)×6=12.5,





(183)27﹣17x=13.4,





(184)9.6+3x=3.24×5,





(185)2x+5=5x﹣7,





(186) 3(x﹣2)=2﹣5(x﹣2),





(187)4x﹣3(20﹣x)+4=0,






(188)﹣=1,





(189)4x﹣5×6=12,





(190)8x﹣3x=15.6,





(191)30×(x÷4)=60,





(192)7.2×0.5﹣3x=1.2,





(193)5x﹣2.4×5=8,





(194)+x=×2,




(195)5x+2.4×15=66,






12
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(196)3.2x+2.8x-x=1,









(197)2.5×16-8x=12,








(198)9.6-3x=6.3,








(199)5(x+6)=75,








(200)x÷0.7+0.9×3=4,




























13
页 共 28 页



解方程专项练习200题
答案:
(1)x﹣=,
1÷(x﹣)×(x﹣)=6×(x﹣),
1=6×(x﹣),
=,



x=;

(2) x××=,
x=,

x×21=×21,

x=12;

(3) ﹣4x=,
﹣4x+4x=+4x,
=+4x,
÷4=4x÷4,

x=.
(4) 8×2.5﹣2x=13.6
20﹣2x=13.6,
13.6+2X=20,
2X=6.4,
x=3.2;
(5) 0.78:x=3:5,
3x=0.78×5,
3x=3.9,
x=1.3
(6)1﹣20%x=0.4,
1﹣20%x+20%x=0.4+20%x,
0.4+20%x=1,
0.4+20%x﹣0.4=1﹣0.4,
20%x=0.6,
20%x×=0.6×,
x=3;
(8) 1÷(x﹣)=6,

6x﹣6×=1,
6x﹣3=1,
6x=4,
6x÷6=4÷6,
x=

(9)2x﹣x=1.2,
x(2﹣)=1.2,
x=1.2,

x÷=1.2÷,

x=1;

(10)9×3﹣1.7x=13.4,
27﹣1.7x=13.4,
27﹣1.7x+1.7x=13.4+1.7x,
13.4+1.7x=27,
13.4+1.7x﹣13.4=27﹣13.4,
1.7x=13.6,
1.7x÷1.7=13.6÷1.7,
x=8
(11)x﹣25%x=24,
75%x=24,
75%x÷75%=24÷75%,
x=32;

(12)x﹣+0.2=,
x﹣0.6=,
x﹣0.6+0.6=+0.6,
x=,
x÷=÷,
x=1


(13)0.6x+90%x=78,

14
页 共 28 页



1.5x=78,
1.5x÷1.5=78÷1.5,
x=52;

(14)20%x﹣2.4×3=0.8,
20%x﹣7.2=0.8,
20%x﹣7.2+7.2=0.8+7.2,
20%x÷20%=8÷20%,
x=40;

(15)x﹣x=42,
x=42,

x÷=42÷,

x=252
(16)0.6x+3×2.5=67.5,
0.6x+7.5=67.5,
0.6x+7.5﹣7.5=67.5﹣7.5,
0.6x=60,
0.6x÷0.6=60÷0.6,
x=100;


(17)1÷(x﹣0.45)=5,
÷(x﹣0.45)×(x﹣0.45)=(x﹣0.45),
x﹣2.4=1.6,

x﹣2.4+2.4=1.6+2.4,
x=4,


x÷=4÷,
x=
(18)x﹣2.25=8.25,
x﹣2.25+2.25=8.25+2.25,
x=10.5;
(19):x=3:12,
3x=×12,
3x÷3=9÷3,
x=3

(20)x+0.8=5.6,
x+0.8﹣0.8=5.6﹣0.8,

x=4.8,

x×=4.8×,

x=8.
(21) 1.4:x=1:0.75,
x=1.4×0.75,
x=1.05
(22) x×(2﹣)=24,
x×=24,
x×÷=24÷,
x=20;
(23) 4x﹣=3,
4x﹣+=3+,
4x=4,
4x÷4=4÷4,
x=1
(24)12x+7×0.3=20.1,
12x+2.1=20.1,
12x+2.1﹣2.1=20.1﹣2.1,
12x÷12=18÷12,
x=1.5;
(25)x+x=,
x=,

x×,

x=;
(26)x:42=,
10x=42×,
10x÷10=30÷10,
x=3


(27)×0.5+x=,

15
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0.75+x=3.75,
0.75+x﹣0.75=3.75﹣0.75,
x=3,

x÷=3÷,

x=6;

(28)0.8:=0.48:x,
0.8x=×0.48,
0.8x=0.2,
0.8x÷0.8=0.2÷0.8,
x=
(29)χ﹣χ=,
x=,

x=,

x=3;

(30)42:=χ:
x=42×,
x=30,
x=50;

(31)5x﹣0.4=75%,
5x﹣0.4+0.4=75%+0.4,
5x÷5=1.15÷5,
x=0.23


( 32) 6x﹣0.9=4.5,
6x﹣0.9+0.9=4.5+0.9,
6x=5.4,
6x÷6=5.4÷6,
x=0.9;

(33)2(x﹣3)=5.8,
2(x﹣3)÷2=5.8÷2
x﹣3=2.9,

x﹣3+3=2.9+3,
x=5.9;
(34) 1.6x=6.4,
1.6x÷1.6=6.4÷1.6,
x=4;
(35) 4x﹣3×9=29,
4x﹣27=29,
4x﹣27+27=29+27,
4x=56,
4x÷4=56÷4,
x=14;
(36)16+8x=40,
16+8x﹣16=40﹣16,
8x=24,
8x÷8=24÷8,
x=3;
(37) x÷1.1=3,
x÷1.1×1.1=3×1.1,
x=3.3
(38)+2x=,
+2x=,
2x=,
2x÷2=÷2,
x=;
(39)×3﹣7x=1.04,
2.16﹣7x=1.04,
2.16﹣7x﹣1.04=1.04﹣1.04,
1.12﹣7x=0,
7x÷7=1.12÷7,
x=0.16;
(40)x﹣1﹣x=2,
x﹣1=2,

x﹣1+1=2+1,

x=3,

x=3,

x=18;
(41)x﹣x=14,

16
页 共 28 页



x=14,
x=14,
x=18;
(42)3x﹣x=,
x=,
x=,
x=;
(43)=,
2.4x=72×0.26,
2.4x=18.72,
2.4x÷2.4=18.72÷2.4,
x=7.8;
(44)1.2:=,
x=1.2×5,
x=6,
x=6,
x=9;
(45)=:,
x=18×,
x=,
x=,
x=12;
(46):=x:0.8,
x=×0.8,
x=0.04,
x=0.2;
(47)x=+1,
x×=×,

x=1
(48) 1﹣25%X+25%x=+25%x,
0.25x+0.25﹣0.25=1﹣0.25,
0.25x=0.75,
x=3;
=,
(49)
0.25x=1.25×1.6,
0.25x÷0.25=1.25×1.6÷0.25,
x=8;
×X=,
(50)
×X÷=,
x=;
(51) 5:8=x:32,
8x=5×32,
8x÷8=5×32÷8,
x=20
(52)2x+3×0.9=24.9,
2x+2.7=24.9,
2x+2.7﹣2.7=24.9﹣2.7,
2x÷2=22.2÷2,
x=11.1;
(53)5.3x﹣2.9x=,
2.4x=,
2.4x÷2.4=÷2.4,
x=;
(54)×(7﹣2.8x)=1.5,
×(7﹣2.8x)=1.5,
7﹣2.8x=2.1,
7﹣2.8x+2.8x=2.1+2.8x,
7﹣2.1=2.1+2.8x﹣2.1,
4.9÷2.8=2.8x÷2.8,
x=1.75;
(55)x:0.3=:,
x=0.3×,

17
页 共 28 页





x=,
x=
(56)150%x+66=99
1.5x+66=99
1.5x=33
x=22
(57)x+6﹣0.8x=16
0.2x+6=16
0.2x=10
x=50

(58)


x=14.4

(59)
0.55x=5.5
x=10
(60)3÷(X﹣)=1.3
3÷(X﹣)×(x﹣)=1.3×(x﹣),
3=1.3x﹣0.78,
3+0.78=1.3x﹣0.78+0.78,
4.68=1.3x,
4.68÷1.3=1.3x÷1.3,
x=3.6;
(61)(X+0.5):2=(X﹣4):,
×(x﹣4)=(x+0.5)×,
x﹣×4=x+×0.5,
x﹣10﹣x=x+x,
2.25x﹣10+10=0.125+10,
2.25x÷2.25=10.125÷2.25,
x=4.5
(62) X÷0.05=3.528,
X÷0.05×0.05=3.528×0.05,
X=0.1764;

(63)2X﹣4×6=80,
2X﹣24=80,

2X﹣24+24=80+24,
2X=104,
2X÷2=104÷2,
X=52;
(64)4×4.5﹣3X=6.38,
18﹣3X=6.38,
18﹣3X+3X=6.38+3X,
6.38+3X=18,
6.38+3X﹣6.38=18﹣6.38,
3X=11.62,
3X÷3=11.62÷3,
X=;
(65)4X﹣7.2=10,
4X﹣7.2+7.2=10+7.2,
4X=17.2,
4X÷4=17.2÷4,
X=4.3;
(66)11.5X+X=20,
12.5X=20,
12.5X÷12.5=20÷12.5,
X=1.6;
(67)3.8×12+15X=87.6,
45.6+15X=87.6,
45.6+15X﹣45.6=87.6﹣45.6,
15X=42,
15X÷15=42÷15,
X=2.8
(68)6X+5=17,
6x+5﹣5=17﹣5,
6x÷6=12÷6,
x=2;

(69)0.6×(2.5+X)=4.2,
0.6×(2.5+X)÷0.6=4.2÷0.6,
2.5+x=7,
2.5+x﹣2.5=7﹣2.5,
x=4.5;

(70):=X:,
x=×,

x÷=,

x=0.6



18
页 共 28 页





(71),





(72)





(73),





(74)4(+x)=,
+4x=,
+4x﹣=﹣,
4x=4,
x=1;
(75)×0.25+x=,
0.2+x=,
0.2+x﹣0.2=﹣0.2,
x=,

x=

(76)x﹣,





x=;

(77)200:6=x:,
6x=200×,
6x÷6=480÷6,
x=80

(78)4÷X=,
4÷X×X=X,
X=4,

X÷=4÷,

X=10;

(79)8(x﹣2)=2(x+7),
8X﹣16=2X+14,
6X﹣16=14,
6X=30,
X=5;

(80):18%=,
X=0.18×6.5,

X=1.17,

X=7.8

﹣2x=,
(81)
﹣2x+2x=+2x,

+2x=,

+2x﹣=﹣,

2x=,

19
页 共 28 页






2x÷2=
x=
÷2,

x=
x+x=46,
(87)8(2X﹣7)=5(X+13),
16x﹣56=5x+65,
16x﹣56﹣5x=5x+65﹣5x,
(82)
x(+)=46,
x=46,

x÷=46÷,

x=40;

(83):x=:,
x=×,

x=,

x÷=÷,

x=;

(84)=,
1.6x=6.4×2,
1.6x=12.8,
1.6x÷1.6=12.8÷1.6,
x=8

(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)
15x﹣20﹣2x+2=10x﹣5,
13x﹣18=10x﹣5,
13x﹣18﹣10x=10x﹣5﹣10x,
3x﹣18=﹣5,
3x﹣18+18=﹣5+18,
3x=13,
3x÷3=13÷3,
x=;
(86)=,
3(6x﹣1)=64,
18x﹣3=64,
18x﹣3+3=64+3,
18x=67,
18x÷18=67÷18,

11x﹣56=65,
11x﹣56+56=65+56,
11x=121,
11x÷11=121÷11,
x=11,

(88)3(x+4.5)=60,
3(x+4.5)÷3=60÷3,
x+4.5=20,
x+4.5﹣4.5=20﹣4.5,
x=15.5
(89)1.6x+2.4=7.52,
1.6x+2.4﹣2.4=7.52﹣2.4,
1.6x=5.12,
1.6x÷1.6=5.12÷1.6,
x=3.2;

(90)3(x﹣0.8)=6.3,
3x﹣2.4=6.3,
3x﹣2.4+2.4=6.3+2.4,
3x=8.7,
3x÷3=8.7÷3,
x=2.9;

(91)28.4﹣5x=5.8,
28.4﹣5x+5x=5.8+5x,
5.8+5x=28.4,
5.8+5x﹣5.8=28.4﹣5.8,
5x=22.6,
5x÷5=22.6÷5,
x=4.52

(92)x:=

25x=×3,

25x=,
25x÷25=,
x=;


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(93)+2x=,
+2x=,
2x=0,
x=0;
(94)x=15%,
x×x=15%x,
0.15x=0.15,
0.15x÷0.15=0.15÷0.15,
x=1;
(95)x﹣x=,
x=,
x=,
x=.

(96)x+50%x=6,
1.5x=6,
1.5x÷1.5=6÷1.5,
x=4;
(97):x=0.3:12,
0.3x=,
0.3x÷0.3=9÷0.3,
x=30;
(98)4x+2(8﹣x)=26,
4x+16﹣2x=26,
2x+16=26,
2x+16﹣16=26﹣16,
2x÷2=10÷2,
x=5
(99)x﹣=0,
x﹣+=0+,
x=,
x×3=×3,
x=;

(100)+x=1,
+x﹣=1﹣,
x=,
x×=×,
x=1;
(101)x×(+)=,
x=,
x×=×,
x=.
(102),


3x÷3=,
x=;
(103),



x=20;
(104)x﹣,


x=;
(105)x×,
x×,
x=
(106)5x+35=650,

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5x+35﹣35=650﹣35,
5x=615,
5x÷5=615÷5,
x=123;
(107)720÷3x=80,
720÷3x×3x=80×3x,
240x=720,
240x÷240=720÷240,
x=3;
(108)3.6x﹣0.9x=8.1,
(3.6﹣0.9)x=8.1,
2.7x=8.1,
2.7x÷2.7=8.1÷2.7,
x=3;

(109)4×4.5﹣3x=6,
18﹣3x=6,
18﹣3x+3x=6+3x,
6+3x=18,
6+3x﹣6=18﹣6,
3x=12,
3x÷3=12÷3,
x=4
(110)=,
2.5x=10×0.8,
2.5x÷2.5=8÷2.5,
x=3.2;

(111)6×3﹣1.8X=7.2,
18﹣1.8X=7.2,
18﹣1.8X+1.8X=7.2+1.8X,
7.2+1.8X=18,
7.2+1.8X﹣7.2=18﹣7.2,
1.8X=10.8,
1.8X÷1.8=10.8÷1.8,
X=6
(112)÷x=,
x=÷,
x=;

(113)x÷=42,
x=42×,
x=9;


(114)x+=,
x+﹣=﹣,
x=,

x÷=÷,

x=
(115)7x÷3=8.19,
7x÷3×3=8.19×3,
7x=24.57,
7x÷7=24.57÷7,
x=3.51;
(116)12:0.6=x:,
0.6x=12×,
0.6x=6,
0.6x÷0.6=6÷0.6,
x=10;

(117)3(x+2)=4(x+1),
3x+6=4x+4,
3x+6﹣3x=4x+4﹣3x,
x+4=6,
x+4﹣4=6﹣4,
x=2


(118)3x﹣70%x=9.2,
3x﹣0.7x=9.2,
2.3x=9.2,
2.3x÷2.3=9.2÷2.3,
x=4;
(119) 6+x=240,
6+x﹣6=240﹣6,
x=234,

x÷=234÷,
x=390
(120)22.5﹣0.4x=12.5,
22.5﹣0.4x+0.4x=12.5+0.4x,
12.5+0.4x=22.5,

22
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12.5+0.4x﹣12.5=22.5﹣12.5,
0.4x÷0.4=10÷0.4,
x=25;
(121)x:3.5=4:2,
2x=3.5×4,
2x÷2=14÷2,
x=6
(122)x﹣0.8x﹣6=16,
0.2x﹣6=16,
0.2x﹣6+6=16+6,
0.2x÷0.2=22÷0.2,
x=110;
(123):=x:8,
x=8×,
x×=8××,
x=4;

(124),
0.06x=2×0.015,
0.06x÷0.06=0.03÷0.06,
x=0.5;
(125)x:15=:,
x=15×,
x×6=15××6,
x=40;
(126)x+x=,
x=,
x×=×,
x=;
(127)x×50%﹣x=5,
x=5,

x×6=5×6,


x=30;
(128)1﹣x=,
1﹣x+x=+x,
+x=1,

+x﹣=1﹣,

x×=×,

x=;
(129)2.5+1x=3,
2.5+1x﹣2.5=3﹣2.5,
x=,

x×=×,

x=
(130)3x﹣2=4,
3x﹣2+2=4+2,
3x=6,
3x÷3=6÷3,
x=;
(131)8.5﹣3x=2,
8.5﹣3x+3x=2+3x,
3x+2=8.5,
3x+2﹣2=8.5﹣2,
3x=6,
3x÷3=6÷3,
x=2;
(132)3÷x=4,
3÷x×x=4×x,

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4x=3,
4x÷4=3÷4,
x=
(133)x﹣5%=17.54,
解:x﹣5%+5%=17.54+5%,
x=17.59,
x=23;
(134):=:(4﹣x),
解:4x=,
2﹣x+x=x,
2﹣+x,
=x,

x=3
(135) 6x+31=49,
6x+31﹣31=49﹣31,
6x=18,
6x÷6=18÷6,
x=3;
(136) 7x÷3=8.19,
7x÷3×3=8.19×3,
7x=24.57,
7x÷7=24.57÷7,
x=3.51;
(137) 32.8﹣9x=17.5,
32.8﹣9x+9x=17.5+9x,
17.5+9x=32.8,
17.5+9x﹣17.5=32.8﹣17.5,
9x=15.3,
9x÷9=15.3÷9,
x=1.7;
(138) x﹣0.36x=16,
(1﹣0.36)x=16,
0.64x=16,
0.64x÷0.64=16÷0.64,
x=25;
(139) 6×7+3x=69,

42+3x=69,
42+3x﹣42=69﹣42,
3x=27,
3x÷3=27÷3,
x=9;
(140) 6x+2x﹣56=0,
(6+2)x﹣56+56=0+56,
8x=56,
8x÷8=56÷8,
x=7
(141) 3x﹣0.45×4=2.7,
3x﹣1.8=2.7,
3x﹣1.8+1.8=2.7+1.8,
3x=4.5,
3x÷3=4.5÷3,
x=1.5;
(142) 5.8x﹣4.6x=0.96,
1.2x=0.96,
1.2x÷1.2=0.96÷1.2,
x=0.8;
(143) 8.4÷(9﹣x)=3,
9﹣x=8.4÷3,
9﹣x=2.8,
x=9﹣2.8,
x=6.2;
(144) 3x÷1.2=8,
3x÷1.2×1.2=8×1.2,
3x=9.6,
3x÷3=9.6÷3,
x=3.2
(145)5x+28=71,
5x+28﹣28=71﹣28,
5x=43,
5x÷5=43÷5,
x=8.6;

(146)8.7﹣1.2x=3.9,
8.7﹣1.2x+1.2x﹣3.9=3.9+1.2x﹣3.9,
4.8=1.2x,
1.2x=4.8,
1.2x÷1.2=4.8÷1.2,
x=4;
(147)8x﹣2.6x=37.8,
5.4x=37.8,
5.4x÷5.4=37.8÷5.4,
x=7;

(148)0.75x﹣0.95×4=8.5,
0.75x﹣3.8=8.5,

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0.75x﹣3.8+3.8=8.5+3.8,
0.75x=12.3,
0.75x÷0.75=12.3÷0.75,
x=16.4,;
(149)54÷2+3x=72,
27+3x=72,
27+3x﹣27=72﹣27,
3x=45,
3x÷3=45÷3,
x=15;

(150)8x﹣2.6=37.8,
8x﹣2.6+2.6=37.8+2.6,
8x=40.4,
8x÷8=40.4÷8,
x=5.05

(151)x÷=,
x÷×=×,
x=,
x×4=×4,
x=;
(152)x+30%x=26,
(1+30%)x=26,
1.3x=26,
1.3x÷1.3=26÷1.3,
x=20;
(153) 7.8﹣3x=3.6,
7.8﹣3x+3x=3.6+3x,
3.6+3x=7.8,
3.6+3x﹣3.6=7.8﹣3.6,
3x=4.2,
3x÷3=4.2÷3,
x=1.4
(154) 6×3﹣1.8x=7.2,
18﹣1.8x=7.2,
18﹣1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18﹣7.2=7.2+1.8x﹣7.2,
10.8=1.8x,
10.8÷1.8=1.8x÷1.8,
x=6;
(155)10:x=4.5:0.8,
4.5x=10×0.8,

4.5x=8,
4.5x÷4.5=8÷4.5,
x=;
(156):=x:,
x=×,

x=,

x÷=÷,

x=
(157)X﹣7.65=4.64,
X﹣7.65+8.67=4.64+7.65,
X=12.29;
(158)28.25﹣X=8.25,
28.25﹣X+X=8.25+X,
X+8.25=28.25,
X+8.25﹣8.25=28.25﹣8.25,
X=20;
(159)X﹣(3.6+2.97)=12.42,
X﹣6.57=12.42,
X﹣6.57+6.57=12.42+6.57,
X=18.99
(160)÷x=,
÷x×x=×x,

x=,

x÷=÷,
x=×,
x=;
(161)14.5=5.5,
14.5+14.5=5.5+14.5,
=20,

×8=20×8,

x=160

(162)x﹣80%x=48,

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(1﹣0.8)x=48,
0.2x=48,
0.2x÷0.2=48÷0.2,
x=240;

(163)75%x﹣5×=6,
0.75x﹣3=6,
0.75x﹣3+3=6+3,
0.75x=9,
0.75x÷0.75=9÷0.75,
x=12
(164)x﹣6.8=15.4,
x﹣6.8+6.8=15.4+6.8,
x=22.2;

(165)1.9x=5.7,
1.9x÷1.9=5.7÷1.9,
x=3;

(166)4.3y﹣y=4.6,
3.3y=4.6,
3.3y÷3.3=4.6÷3.3,
y=;
(167)5x+2.6=7.6,
5x+2.6﹣2.6=7.6﹣2.6,
5x=5,
5x÷5=5÷5,
x=1
(168) x﹣1.5=12.9,
x﹣1.5+1.5=12.9﹣1.5,
x=11.4;
(169) 9x+5x=8.4,
14x=8.4,
14x÷14=8.4÷14,
x=0.6;
(170) 6.8+3.2x=14.8,
6.8﹣6.8+3.2x=14.8﹣6.8,
3.2x=8,
3.2x÷3.2=8÷3.2,
x=2.5
(171)5÷x=,
5÷x×x=x,
5=x,

5÷=x÷,
x=;
(172)﹣x=,
﹣x+x=+x,
=+x,

﹣=+x﹣,
=x,

÷==x÷,
x=1;

(173)4.5×﹣3x=1.5,
1.5﹣3.5x=1.5,
1.5﹣3.5x+3.5x=1.5+3.5x,
1.5=1.5+3.5x,
1.5﹣1.5=1.5+3.5x﹣1.5,
0=3.5x,
0÷3.5=3.5x÷3.5,
x=0
(174)(1+25%)x=0.5,
1.25x=0.5,
1.25x÷1.25=0.5÷1.25,
x=0.4;

(175)x﹣40%x=9,
0.6x=9,
0.6x÷0.6=9÷0.6,
x=15;

(176)x×20%=15.2,
x×20%÷20%=15.2÷20%,
x=76
(177)30x﹣30=180,
30x﹣30+30=180+30,
30x=210,
30x÷30=210÷30,
x=7;
(178)x﹣x=,
x=,


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x÷=÷,

x=;

(179)x÷75%=3,
x÷75%×75%=3×75%,
x=,

x÷=÷,

x=
(180)4x﹣,
4x﹣6=2.4,
4x=2.4+6,
x=8.4÷4,
x=2.1.
(181):x=:4.5,
x=4.5×,

x=2,

x=2×,
x=5

(182)(x﹣4.5)×6=12.5,
6x﹣4.5×6=12.5,
6x﹣27=12.5,
6x﹣27+27=12.5+27,
6x=39.5,
6x÷6=39.5÷6,
x=6;
(183)27﹣17x=13.4,
27﹣17x+17x=13.4+17x,
13.4+17x=27,
13.4+17x﹣13.4=27﹣13.4,
17x=13.6,
17x÷17=13.6÷17,
x=0.8;
(184)9.6+3x=3.24×5,
9.6+3x﹣9.6=16.2﹣9.6,
3x=6.6,

3x÷3=6.6÷3,
x=2.2
(185)2x+5=5x﹣7,
2x+5﹣2x=5x﹣7﹣2x,
3x﹣7=5,
3x﹣7+7=5+7,
3x=12,
3x÷3=12÷3,
x=4;
(186) 3(x﹣2)=2﹣5(x﹣2),
3x﹣6=12﹣5x,
3x﹣6+5x=12﹣5x+5x,
8x﹣6=12,
8x﹣6+6=12+6,
8x=18,
8x÷8=18÷8,
x=2.25;

(187)4x﹣3(20﹣x)+4=0,
7x﹣56=0,
7x﹣56+56=0+56,
7x=56,
7x÷7=56÷7,
x=8;

(188)﹣=1,
(﹣)×24=1×24,
6(y+2)﹣4(2y﹣3)=24,
30﹣2y=24,
30﹣2y+2y=24+2y,
2y+24=30,
2y+24﹣24=30﹣24,
2y=6,
2y÷2=6÷2,
y=3
(189)4x﹣5×6=12,
4x﹣30=12,
4x﹣30+30=12+30,
4x=42,
4x÷4=42÷4,
x=10.5;

(190)8x﹣3x=15.6,
5x=15.6,
5x÷5=15.6÷5,
x=3.12;


27
页 共 28 页





(191)30×(x÷4)=60,
30×(x÷4)÷30=60÷30,
x÷4=2,
x÷4×4=2×4,
x=8;

(192)7.2×0.5﹣3x=1.2,
3.6﹣3x=1.2,
3.6﹣3x+3x=1.2+3x,
3x+1.2=3.6,
3x+1.2﹣1.2=3.6﹣1.2,
3x=2.4,
3x÷3=2.4÷3,
x=0.8

(193)5x﹣2.4×5=8,
5x﹣12+12=8+12,
5x=20,
5x÷5=20÷5,
x=4,

(194)+x=×2,
x=,
x×=×,
x=.
(195)5x+2.4×15=66,
5x+36=66,
5x+36-36=66-36,
5x=30,
5x÷5=30÷5,
x=6;
(196)3.2x+2.8x-x=1,
5x=1,
5x÷5=1÷5,
x=0.2;
(197)2.5×16-8x=12,
40-8x=12,
40-8x+8x=12+8x,
8x+12=40,
8x+12-12=40-12,
8x=28,
8x÷8=28÷8,
x=3.5.
(198)9.6-3x=6.3,
9.6-3x+3x=6.3+3x,

6.3+3x=9.6,
6.3+3x-6.3=9.6-6.3,
3x=3.3,
3x÷3=3.3÷3,
x=1.1;
(199)5(x+6)=75,
5x+30=75,
5x+30-30=75-30,
5x=45,
5x÷5=45÷5,
x=9;
(200)x÷0.7+0.9×3=4,
x÷0.7+2.7=4,
x÷0.7+2.7-2.7=4-2.7,
x÷0.7=1.3,
x÷0.7×0.7=1.3×0.7,
x=0.91.


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页 共 28 页

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