五年级解方程练习题180题及答案.doc
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五年级解方程
(1)
(0.5+x)+x=9.8
÷2
(
2) 2(X+X+0.5)=9.8
(
3) 25000+x=6x
(
4) 3200=440+5X+X
(
5) X-0.8X=6
(6)12x-8x=4.8
(7)
7.5+2X=15
(8)1.2x=81.6
(
7) x+5.6=9.4
(10)x-0.7x=3.6
(11)91
÷x=1.3
(12) X+8.3=10.7
(13) 15x
=3
(14) 3x -8=16
(15) 3x+9=27
(16) 18(x-2)=270
(17)
12x=300-4x
(18) 7x+5.3=7.4
(19) 3x
÷5=4.8
(25)
0.5x+8=43
(26)
6x-3x=18
(27)
7(6.5+x)=87.5
(28)
0.273
÷x=0.35
(29)
1.8x=0.972
(42 ) 5.6x=33.6
(30) x
÷ 0.756=90
(43)
9.8-x=3.8
(31) 0.1(x+6)=3.3
× 0.4
(44) 75.6 ÷ x=12.6
(32) (27.5-3.5)
÷ x=4
(33)
9x-40=5
(34) x
÷ 5+9=21
(35)
48-27+5x=31
(36)
10.5+x+21=56
(37) x+2x+18=78
(38)
(200-x)
÷5=30
(39)
(x-140)
÷ 70=4
(40)
20-9x=2
(41) x+19.8=25.8
(45)
(46)
(47)
(48)
(49)
(50)
(51)
(52)
(5
3)
×7+4x=12.5
x ÷ 1.5-1.25=0.75
4x-1.3
× 6=2.6
5x+12.5=32.3
5(x+8)=102
x+3x+10=70
3(x+3)=50-x+3
5x+15=60
3.5-5x=2
0.3
(54)
6x+12.8=15.8 (66)13(x+5)=169
(55) 150 ×
2+3x=690 (67) 2x-97=34.2
(56)
(57)
(58)<
br>(59)
(60)
(61)
(62)
(63)
(64)
(65)
2x-20=4
3x+6=18
2(2.8+x)=10.4
(x-3) ÷2=7.5
13.2x+9x=33.3
3x=x+100
x+4.8=7.2
6x+18=48
3(x+2.1)=10.5
12x-9x=8.7
(68)3.4x-48=26.8
(69)42x+25x=134
(70)1.5(x+1.6)=3.6
(71)2(x-3)=5.8
(72)65x+7=137
(73) 9x+4 ×2.5 =91
(74)
4.2 x+2.5x =134
(75) 10.5x+6.5x=51
(76) 89x-43x=9.2
(77) 5x-45=100
(78) 1.2x-0.5x=6.3
(79) 23.4=2x
(80) 4x-x=48.6
(81)
4.5x-x=28
(82)X-5.7=2.15
(83)5X-2X=18
(84)3X+0.7=7
( 85) 3.5 ×2= 4.2+x
(86) 26 ×1.5= 2x+10
(87) 0.5 × 16―16×0.2=4x
(88) 13 9.25
-X=0.403
(89) 18.9
÷X=0. 3
(90) 23x=14x +27
(91) x +14x=75
(92 )95-5x= 80
(93)1.8 +6x =54
(94) 6.7x
-60.3
=6.7
(95) 9 +4x=53
(96) 2x+8=16
(97)
20x-14x=24
(98) x+7x=8
(99) 9x-3x=6
(100 ) 6x-8=4
(101) 5x+x=9
(102)
8x-8=6x
(103)
4
x=20
5
(104) 2x-6=12
(105 ) 7x+7=14
(106) 6x-6=0
(107)
5x+6=11
(108) 2x-8=10
(109) 2.5x-8=4
(110) x-
3
=7
4
(111)3x+7=28
(112)
3x-7=26
(113) 9x-x=16
(114) 24x+x=50
(115) 1.2x-8=4
(116) 3x-8=31
(117) 6x+6=12
(118) 3x-3=3
(119)
5x-3x=4
(120) 2x+16=19
(121) 5x+8=19
(122) 14-6x=8
(123) 15+6x=27
(124) 5-8x=4
(125) 7x+8=15
(126) 9-2x=1
(127) 4+5x=9
(128) 10-x=8
(129) 8x+9=17
(130) 9+6x=15
(131)
x+9x=4+7
(132)
2x+9=17
(133) 8-4x=6
(134) 6x-7=28
(135) 7x-9=20
(136) x-56=1
(137)
8-7x=1
(138)x-30=12
(139) 6x-21=21
(140) 6x-3=6
(141) 9x=18
(142)
4x-18=14
(143) 5x+9=11
(144) 17-2x=11
(145) x+4+8=23
(146) 7x-12=9
(147) X-5.7=2.15
(148) 5X-2X=18
(149)
3X +0.5=5
(150) 3.5 ×2= 4 x
(151) 26 ×1.5=
2x
(152) 0.5
×16―16× 0.1=4x
(153) 9.26
-
X=0.402
(154) 36.9
÷X=0.3
(155) X ÷0.5=2.6
(156) 93 - 5x=80
(157) 180-6x
=54
(158) 9 +4x= 40
(159) 0.2x
-0.4 +0.5 = 3.7
(160) 9.4x
-0.4x = 16.2
(161) 92 - 4x=20
(162) 7x ÷ 6=1.4
(163) 16x +34x=1
(164) 18x -14x=12
(165) 3 x
-42÷14=15
(166) 12 + 4x=56
(167) 22 -
14x=12
(168) X+8.3=10.7
(169) 5x
=30
(170) x-5.6=9.4
(171) x ÷0.8=90
(172) 3x - 8= 16
(173) 3x+9=27
(174)
5.3+7x=7.4
(175) 3x ÷ 5=4.8
(181) x ÷5+9=21
(176)
X-0.8X=6
(177) 12x+8x=4.8
(182)(300-x)
÷5=30
(178) 7(x-2)=49
(183) 91 ÷ x =1.3
(179) 4 ×8+2x=36
(184) 41-3x=17
÷ 3=7
(180) (x-2)
五年级解方程
180题答案
X=2.2
÷ 2 ( 3) 25000+x=6x
25000+x-x=6x-x
5x=25000
5x ÷5=25000÷
5
X=5000
( 4) 3200=440+5X+X
6x+440=3200
6x+450-450=3200-440
6x=2760
6x ÷ 6=2760÷ 6
X=460
( 1)
(0.5+x)+x=9.8
0.5+2x=4.9
2x=4.4
2x
X=2.2
2x+2x+1=9.8
4x=8.8
4x
0.5+2x-0.5=4.9-0.5
÷ 2=4.4 ÷ 2
( 2) 2(X+X+0.5)=9.8
4x+1-1=9.8-1
÷4=8.8 ÷ 4
(
5) X-0.8X=6
0.2x=6
0.2=6 ÷ 0.2
0.2x
÷
X=30
(6)12x-8x=4.8
4x=4.8
4x ÷ 4=4.8 ÷ 4
X=1.2
(7) 7.5+2X=15
2x+7.5-7.5=15-7.5
2x=7.5
2x ÷ 2=7.5 ÷ 2
X=3.75
(8)
1.2x=81.6
1.2x ÷
1.2=81.6 ÷ 1.2
X=68
(9) x+5.6=9.4
X+5.6-5.6=9.4-5.6
X=3.8
(10)x-0.7x=3.6
0.3x=3.6
0.3x ÷ 0.3=3.6 ÷ 0.3
X=12
(11)91 ÷ x= 1.3
91 ÷ x× x=1.3 ×
x
1.3x=91
1.3x ÷ 1.3=91 ÷ 1.3
X=70
(12) X+8.3=10.7
X+8.3-8.3=10.7-8.3
X=2.4
(13) 15x
= 3
15x
÷ 15=3÷ 15
X=0.2
(14)
3x - 8=16
3x-8+8=16+8
3x=24
3x ÷ 3=24÷ 3
X=8
(15)
3x+9=27
3x+9-9=27-9
3x=18
3x ÷ 3=18÷ 3
3x=6
(16) 18(x-2)=270
18x-36=270
18x-36+36=270+36
18x=306
18x
÷ 18=306 ÷ 18
X=17
(17) 12x=300-4x
12x+4x=300-4x+4x
16x=300
16x
÷16=300 ÷ 16
X=18.75
(18) 7x+5.3=7.4
7x+5.3-5.3=7.4-
5.3 7x=2.1
7x ÷ 7=2.1
÷7
X=0.3
(19)
3x ÷ 5=4.8
3x ÷5× 5=4.8 × 5
3x=24
3x
÷ 3=24÷ 3
X=8
(20)
30 ÷ x+25=85
30 ÷x+25-25=85-25
30
÷ x=60
30 ÷ x× x=60×
x 30=60x
60x
÷ 60=30÷ 60
X=0.5
(21) 1.4
× 8-2x=6
11.2-2x+2x=6+2x
11.2=6+2x
2x+6-6=11.2-6
2x=5.2
2x
÷ 2=5.2 ÷ 2
X=2.6
(22)
6x-12.8
×3=0.06
6x-38.4=0.06
6x=38.46
6x
÷6=38.46 ÷6
X=6.41
(23) 410-3x=170
410-3x+3x=170+3x
170+3x=410
3x+170-170=410-170
3x=240
3x
÷ 3=240÷3
X=80
(24)
3(x+0.5)=21
3x+1.5=21
3x+1.5-1.5=21-1.5
3x=19.5
3x
÷ 3=19.5 ÷
3
X=6.5
(25)
0.5x+8=43
0.5x+8-8=43-8
0.5x=35
0.5x
÷ 0.5=35 ÷ 0.5
X=70
(26) 6x-3x=18
3x=18
3x
÷ 3=18÷ 3
X=6
(27) 7(6.5+x)=87.5
7x+45.5=87.5
7x+45.5-45.5=87.5-45.5
7x=42
7x
÷ 7=42÷ 7
X=6
(28) 0.273
÷ x=0.35
x=0.273
÷ 0.35
X=0.78
(29)
1.8x=0.972
1.8x
÷1.8=0.972 ÷
1.8
X=0.54
(30)
x
÷ 0.756=90
x÷ 0.756 ×0.756=90 ×
0.756
X=68.04
(31)
0.1(x+6)=3.3
× 0.4
0.1x+0.6=1.32
0.1x+0.6-0.6=1.32-0.6
0.1x=0.72
0.1x
÷
0.1=0.72 ÷ 0.1
X=7.2
(32)
(27.5-3.5)
÷ x=4
24
÷ x=4
x=24
÷ 4
X=6
(33) 9x-40=5
9x-40+40=5+40
9x=45
9x
÷ 9=45÷ 9
X=5
(34) x
÷ 5+9=21
x
÷ 5+9-9=21-9
x
÷ 5=12
x
÷ 5× 5=12× 5
X=60
(35) 48-27+5x=31
5x+21-21=31-21
5x=10
5x
÷ 5=10÷5
X=2
(36) 10.5+x+21=56
x+31.5-31.5=56-31.5
x=24.5
(37) x+2x+18=78
3x+18-18=78-18
3x=60
3x
÷
3=60÷3
X=20
(38) (200-x)
÷ 5=30
(200-x)
÷ 5× 5=30× 5
200-x=150
200-x+x=150+x
150+x=200
X+150-150=200-150
X=50
(39) (x-140)
÷ 70=4
(x-140)
÷ 70×
70=4× 70
X-140=280
X-140+140=280+140
X=420
( 40) 20-9x=2
9x=20-2
9x=18
9x
÷ 9=18÷ 9
X=2
(41) x+19.8=25.8
X+19.8-19.8=25.8-19.8
X=6
(42 )
5.6x=33.6
5.6x
÷5.6=33.6 ÷ 5.6
X=6
( 43)
9.8-x=3.8
9.8-x+x=3.8+x
3.8+x=9.8
X=9.8-3.8
X=6
( 44) 75.6 ÷ x=12.6
X=75.6
÷ 12.6
X=6
( 45) 5x+12.5=32.3
5x+12.5-12.5=32.3-12.5
5x=19.8
5x
÷ 5=19.8 ÷5
X=3.96
( 46)
5(x+8)=102
5x+40=102
5x+40-40=102-40
5x=62
5x
÷ 5=62÷ 5
X=12.4
( 47)
x+3x+10=70
4x+10=70
4x+10-10=70-10
4x=60
4x
÷ 4=60÷ 4
X=15
( 48)
3(x+3)=50-x+3
3x+9=53-x
3x+x+9-9=53-x+x-9
4x=44
4x
÷
4=44÷ 4
X=11
(
49) 5x+15=60
5x+15-15=60-15
5x=45
5x
÷ 5=45÷ 5
X=9
( 50) 3.5-5x=2
3.5-5x+5x=2+5x
5x+2=3.5
5x+2-2=3.5-2
5x=1.5
5x
÷ 5=1.5 ÷5
X=0.3
( 51) 0.3 × 7+4x=12.5
4x+2.1=12.5
4x+2.1-2.1=12.5-2.1
4x=10.4
4x
÷ 4=10.4 ÷ 4
X=2.6
( 52) x ÷ 1.5-1.25=0.75
x ÷
1.5-1.25+1.25=0.75+1.25
x
÷ 1.5=2
x
÷ 1.5 × 1.5=2 × 1.5
X=3
( 53) 4x-1.3
× 6=2.6
4x-1.3 × 6+1.3 × 6=2.6+1.3 × 6
4x=10.4
4x
÷ 4=10.4 ÷ 4
X=2.6
( 54)
6x+12.8=15.8
6x+12.8-12.8=15.8-12.8
6x=3
6x
÷
6=3÷ 6
X=0.5
( 55) 150 × 2+3x=690
3x+300=690
3x+300-300=690-300
3x=390
3x
÷ 3=390÷ 3
X=130
( 56) 2x-20=4
2x-20+20=4+20
2x=24
2x
÷ 2=24÷2
X=12
( 57) 3x+6=18
3x+6-6=18-6
3x=12
3x
÷ 3=12÷ 3
X=4
( 58)
2(2.8+x)=10.4
5.6+2x=10.4
2x+5.6-5.6=10.4-5.6
2x=4.8
2x
÷ 2=4.8 ÷2
X=2.4
(
59) (x-3) ÷ 2=7.5
( x-3 )÷ 2× 2=7.5 ×2
X-3=15
X=18
( 60)
13.2x+9x=33.3
22.2x=33.3
22.2x
÷
22.2=33.3 ÷ 22.2
X=1.5
( 61)
3x=x+100
3x-x=x-x+100
2x=100
2x ÷
2=100÷ 2
X=50
( 62) x+4.8=7.2
X=7.2-4.8
X=2.4
( 63) 6x+18=48
6x+18-18=48-18
6x=30
6x
÷ 6=30÷ 6
x=5
( 64) 3(x+2.1)=10.5
3x+6.3=10.5
3x=10.5-6.3
3x=4.2
3x
÷ 3=4.2 ÷ 3
X=1.4
( 65) 12x-9x=8.7
3x=8.7
3x
÷3=8.7 ÷ 3
X=2.9
( 66)
13(x+5)=169
13x+65=169
13x+65-65=169-65
13x=104
13x
÷13=104 ÷ 13
X=8
( 67) 2x-97=34.2
2x-97+97=34.2+97
2x=131.2
2x
÷ 2=131.2 ÷2
X=65.6
( 68) 3.4x-48=26.8
3.4x-48+48=26.8+48
3.4x=74.8
3.4x
÷ 3.4=74.8 ÷ 3.4
X=22
( 69)
42x+25x=134
67x=134
67x
÷ 67=134
÷ 67
X=2
( 70) 1.5(x+1.6)=3.6
1.5x+2.4=3.6
1.5x=3.6-2.4
1.5x=1.2
1.5x
÷ 1.5=1.2 ÷ 1.5
X=0.8
( 71) 2(x-3)=5.8
2x-6=5.8
2x-6+6=5.8+6
2x=11.8
2x
÷ 2=11.8 ÷ 2
X=5.9
( 72) 65x+7=137
65x+7-7=137-7
65x=130
65x ÷ 65=130 ÷ 65
X=2
( 73) 9x+4 × 2.5 = 91
9x+10=91
9x+10-10=91-10
9x=81
9x
÷ 9=81÷9
X=9
(74) 4.2 x+2.5x
= 134
6.7x=134
6.7x
÷ 6.7=134 ÷ 6.7
X=20
(75) 10.5x+6.5x=51
17x=51
17x
÷ 17=51÷17
X=3
(76)
89x-43x=9.2
46x=9.2
46x
÷46=9.2 ÷
46
X=0.2
(77) 5x-45=100
5x-45+45=100+45
5x=145
5x ÷
5=145÷ 5
X=29
(78) 1.2x-0.5x=6.3
0.7x=6.3
0.7x
÷0.7=6.3 ÷ 0.7
X=9
(79) 23.4=2x
2x
÷ 2=23.4
÷ 2
X=11.7
(80) 4x-x=48.6
3x=48.6
3x
÷ 3=48.6 ÷ 3
X=16.2
(81)
4.5x-x=28
3.5x=28
3.5x
÷ 3.5=28 ÷ 3.5
X=8
(82 ) X-5.7=2.15
X=5.7+2.15
X=7.85
( 83) 5X-2X=18
3x=18
3x
÷3=18÷ 3
X=6
( 84) 3X+0.7=7
3x+0.7-0.7=7-0.7
3x=6.3
3x
÷3=6.3 ÷ 3
X=2.1
( 85) 3.5 × 2= 4.2+x
4.2+x=7
X=7-4.2
X=2.8
(86) 26
× 1.5= 2x+10
2x+10=39
2x+10-10=39-10
2x=29
2x
÷ 2=29÷ 2
X=14.5
(87) 0.5
×16― 16× 0.2=4x
4x=4.8
4x
÷4=4.8 ÷ 4
X=1.2
(88) 13 9.25
- X=0.403
X=139.25-0.403
X=138.847
(89)
18.9
÷ X=0. 3
X=18.9
÷ 0.3
X=63
(90) 23x=14x
+ 27
23x-14x=14x-14x+27
9x=27
9x
÷9=27÷ 9
X=3
(91) x
+
14x=75
15x=75
15x
÷ 15=75÷ 15
X=5
(92 ) 95- 5x= 80
95-5x+5x=80+5x
5x+80=95
5x+80-80=95-80
5x=15
X=3
( 93) 1.8 +6x = 54
6x=54-1.8
6x=52.2
6x
÷ 6=52.2 ÷6
X=8.7
(
94) 6.7x - 60.3 = 6.7
6.7x=60.3+6.7
6.7x=67
6.7x
÷ 6.7=67 ÷ 6.7
X=10
(95) 9
+ 4x= 53
4x=53-9
4x=44
4x ÷ 4=44÷ 4
X=11
(96) 2x+8=16
2x=16-8
2x=8
2x ÷ 2=8÷ 2
X=4
(97) 20x-14x=24
6x=24
6x
÷6=24÷ 6
X=4
(98)
x+7x=8
8x=8
X=1
(99) 9x-3x=6
6x=6
X=1
(100 ) 6x-8=4
6x-8+8=4+8
6x=12
X=2
( 101) 5x+x=9
6x=9
6x
÷ 6=9÷ 6
x=1.5
(
102) 8x-8=6x
8x-8+8=6x+8
8x-6x=6x-6x+8
2x=8
2x÷ 2=8÷ 2
X=4
( 103)
4
x=20
4
5
x÷
4
=20÷
4
5
5
5
X=25
(104)
2x-6=12
2x-6+6=12+6
2x=18
2x÷ 2=18÷ 2
X=9
(105 )
7x+7=14
7x+7-7=14-7
7x=7
7x
÷ 7=7÷ 7
X=1
(
106) 6x-6=0
6x-6+6=0+6
6x=6
X=1
( 107)
5x+6=11
5x+6-6=11-6
5x=5
X=1
(
108) 2x-8=10
2x-8+8=10+8
2x=18
X=9
(
109)
2.5x-8=4
2.5x-8+8=4+8
2.5x=12
2.5x
÷ 2.5=12 ÷2.5
X=4.8
( 110)
x-
3
=7
3
4
+
3
X-
=7+
3
4 4 4
X=7.75
(
111)
3x+7=28
3x+7-7=28-
7 3x=21
3x
÷ 3=21÷ 3
X=7
(112)
3x-7=26
3x-7+7=26+7
3x=33
3x÷ 3=33÷ 3
X=11
(113)
9x-x=16
8x=16
8x ÷ 8=16÷ 8
X=2
(114)
24x+x=50
25x=50
25x ÷ 25=50÷
25
X=2
(115)
1.2x-8=4
1.2x-8+8=4+8
1.2x=12
1.2x
÷ 1.2=12 ÷ 1.2
X=10
(116)
3x-8=31
3x-8+8=31+8
3x=39
3x ÷ 3=39÷ 3
X=13
(117) 6x+6=12
6x+6-6=12-6
6x=6
X=1
(118) 3x-3=3
3x-3+3=3+3
3x=6
3x ÷ 3=6÷ 3
X=2
(119) 5x-3x=4
2x=4
2x ÷2=4÷ 2
X=2
(120) 2x+16=19
2x+16-16=19-16
2x=3
2x ÷2=3÷ 2
X=1.5
(121)
5x+8=19
5x+8-8=19-8
5x=11
5x ÷ 5=11÷
5
X=2.2
(122) 14-6x=8
14-6x+6x=8+6x
6x+8-8=14-8
6x=6
X=1
(123)
15+6x=27
6x+15-15=27-15
6x=12
6x
÷6=12÷ 6
X=2
(124) 5-8x=4
5-8x+8x=4+8x
8x+4-4=5-4
8x=1
8x
÷ 8=1÷ 8
X=0.125
(125) 7x+8=15
7x+8-8=15-8
7x=7
X=1
(126) 9-2x=1
9-2x+2x=1+2x
2x+1-1=9-1
2x=8
2x ÷ 2=8÷ 2
X=4
(127) 4+5x=9
5x+4-4=9-4
5x=5
X=1
(128) 10-x=8
X=10-8
X=2
(129) 8x+9=17
8x+9-9=17-9
8x=8
X=1
(130) 9+6x=15
6x+9-9=15-9
6x=6
X=1
(131)
x+9x=4+7
10x=11
10x ÷ 10=11÷ 10
X=1.1
(132) 2x+9=17
2x+9-9=17-9
2x=8
2x ÷ 2=8÷ 2
X=4
(133)
8-4x=6
8-4x+4x=6+4x
4x+6-6=8-6
4x=2
4x ÷ 2=2÷ 4
X=0.5
(134) 6x-7=28
6x-7+7=28+7
6x=36
6x ÷ 6=36÷ 6
X=6
(135) 7x-9=20
7x-9+9=8+20
7x=28
7x ÷ 7=28÷ 7
X=4
(136)
x-56=1
X=56+1
X=57
(137) 8-7x=1
8-7x+7x=1+7x
7x+1-1=8-1
7x=7
X=1
(138) x-30=12
X-30+30=12+30
X=42
(139) 6x-21=21
6x-21+21=21+21
6x=42
6x
÷6=42÷ 6
X=7
(140) 6x-3=6
6x-3+3=6+3
6x=9
6x ÷ 6=9÷ 6
X=1.5
(141) 9x=18
9x
÷ 9=18÷ 9
X=2
(142) 4x-18=14
4x-18+18=14+18
4x=32
4x
÷4=32÷ 4
X=8
(143) 5x+9=11
5x+9-9=11-9
5x=2
5x ÷ 5=2÷
5
X=0.4
(144) 17-2x=11
17-2x+2x=11+2x
2x+11-11=17-11
2x=6
2x
÷2=6÷ 2
X=3
(145) x+4+8=23
X+12=23
X=23-12
X=11
(146) 7x-12=9
7x-12+12=9+12
7x=21
7x
÷ 7=21÷ 7
X=3
(147)
X-5.7=2.15
x=5.7+2.15
X=7.85
(148) 5X-2X=18
3x=18
3x
÷ 3=18÷ 3
X=6
(149) 3X
+0.5=5
3x+0.5-0.5=5-0.5
3x=4.5
3x
÷ 3=4.5 ÷ 3
X=1.5
(150) 3.5
× 2= 4 x
4x=7
4x
÷ 4=7÷ 4
X=1.75
(151)
26
×1.5= 2x
2x=39
2x
÷ 2=39÷ 2
X=18
(152) 0.5
×
16― 16× 0.1=4x
4x=6.4
4x
÷4=6.4 ÷ 4
X=1.6
(153) 9.26
- X=0.402
X=9.26-0.402
X=8.858
(154) 36.9
÷ X=0.3
X=36.9
÷0.3
X=123
(155) X
÷0.5=2.6
X=0.5
× 2.6
X=1.3
(156)
93 -5x= 80
93-5X+5X=80+5X
5X+80-80=93-80
5X=13
5X
÷ 5=13÷ 5
X=2.6
(157)
180-6x
= 54
180-6X+6X=54+6X
6X+54-54=180-54
6X=126
6X
÷ 6=126÷ 6
X=21
(158) 9
+ 4x= 40
4X+9-9=40-9
4X=31
4X
÷4=31÷ 4
X=7.75
(159)
0.2x -0.4 + 0.5 =
3.7
0.2X-0.5+0.5-0.4+0.4=3.7-0.5+0.4
0.2X=3.6
0.2X÷ 0.2=3.6 ÷ 0.2
X=18
(160) 9.4x -0.4x = 16.2
9X=16.2
9X÷ 9=16.2 ÷9
X=1.8
(161)
92 - 4x= 20
92-4X+4X=20+4X
4X+20-20=92-
20
4X=72
4X
÷ 4=72÷ 4
(162)
X=18
(163)
7x ÷ 6=1.4
7x
÷6× 6=1.4 × 6
7X=8.4
7X
÷ 7=8.4 ÷ 7
X=1.2
(163) 16x
+ 34x=1
50X=1
50X
÷ 50=1÷ 50
X=0.02
(164) 18x
- 14x=12
4X=12
4X
÷ 4=12÷ 4
X=3
(165) 3 x
- 42÷ 14=15
3X-3=15
3X-3+3=15+3
3X=18
3X
÷ 3=18÷3
X=6
(166) 12
+ 4x=56
4X+12-12=56-12
4X=44
4X
÷ 4=44÷ 4
X=11
(167)
22 -14x=12
22-14X+14X=12+14X
14X+12-12=54-12
14X=42
14X
÷ 14=42÷ 14
X=3
(168) X+8.3=10.7
X=10.7-8.3
X=2.4
(169)
5x
= 30
5X÷5=30÷ 5
X=6
(170) x-5.6=9.4
X=5.6+9.4
X=15
(171) x
÷0.8=90
X=0.8
× 90
X=72
(172) 3x
-8= 16
3X-8+8=16+8
3X=24
3X ÷
3=24÷ 3
X=8
(173) 3x+9=27
3X+9-9=27-9
3X=18
3X ÷ 3=18÷
3
X=6
(174) 5.3+7x=7.4
7X+5.3-5.3=7.4-5.3
7X=2.1
7X ÷ 7=2.1 ÷ 7
X=0.3
(175)
3x ÷5=4.8
3X=4.8
× 5
3X=24
3X
÷ 3=24÷ 3
X=8
(176) X-0.8X=6
0.2X=6
0.2X
÷ 0.2=6 ÷ 0.2
X=30
(177) 12x+8x=4.8
20X=4.8
20X ÷ 20=4.8 ÷ 20
X=24
(178) 7(x-2)=49
7X-14=49
7X-14+14=49+14
7X=63
7X ÷7=63÷ 7
X=9
(179) 4
×
8+2x=36
2X+32=36
2X+32-32=36-32
2X=4
2X
÷ 2=4÷ 2
X=2
(180) (x-2)
÷3=7
X-2=3
×
7
X-2=21
X=23
(181) x
÷5+9=21
X
÷ 5=21-9
X
÷ 5=12
X=12
× 5
X=60
(182) (300-x)
÷ 5=30
300-X=30
×5
300-X=150
X=300-150
X=150
(183) 91
÷x = 1.3
X=91
÷ 1.3
X=70
(184)
41-3x=17
41-3X+3X=17+3X
3X+17-17=41-17
3X=24
3X
÷ 3=24÷ 3
X=8