五年级解方程练习题180题 已整理 (有答案)
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五年级解方程180题有答案
(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
1
(11)91÷x=1.3
(12) X+8.3=10.7
(17) 12x=300-4x
(18) 7x+5.3=7.4
(13) 15x=3
(14)
3x-8=16
(15) 3x+9=27
(16) 18(x-2)=270
(19) 3x
(25) 0.5x+8=43
(26) 6x-3x=18
(27) 7(6.5+x)=87.5
2
÷5=4.8
(28)
0.273÷x=0.35
(29) 1.8x=0.972
(30) x÷0.756=90
(31)
0.1(x+6)=3.3×0.4
(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
3
(40) 20-9x=2
(41) x+19.8=25.8
(46)
5(x+8)=102
(47)
x+3x+10=70
(42) 5.6x=33.6
(43) 9.8-x=3.8
(44) 75.6÷x=12.6
(45) 5x+12.5=32.3
(48)
(49)
(50)
(51)
4
×7+4x=12.5
3(x+3)=50-x+3
5x+15=60
3.5-5x=2
0.3
(52) x÷1.5-1.25=0.75
(53) 4x-1.3×6=2.6
(58) 2(2.8+x)=10.4
(59) (x-3)÷2=7.5
(54) 6x+12.8=15.8
(55) 150×2+3x=690
(56) 2x-20=4
(57) 3x+6=18
(60)
(61)
(62)
(63)
5
13.2x+9x=33.3
3x=x+100
x+4.8=7.2
6x+18=48
(64)3(x+2.1)=10.5
(65)12x-9x=8.7
(66)13(x+5)=169
(67) 2x-97=34.2
(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
6
(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
7
(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
8
(99)
9x-3x=6
(100) 6x-8=4
(101) 5x+x=9
(102)
8x-8=6x
(103)
4
5
x=20
(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
4
=7
(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
9
(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
10
(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
11
(171) x÷0.8=90
(172) 3x-8=16
(173)
3x+9=27
(174) 5.3+7x=7.4
(175) 3x÷5=4.8
(176) X-0.8X=6
(177) 12x+8x=4.8
(178)
7(x-2)=49
(179) 4×8+2x=36
(180)
(x-2)÷3=7
(181) x÷5+9=21
(182)(300-x)÷5=30
(183) 91÷x =1.3
(184) 41-3x=17
12
五年级解方程180题答案
(1)(0.5+x)+x=9.8÷2
0.5+2x=4.9
0.5+2x-0.5=4.9-0.5
2x=4.4
2x÷2=4.4÷2
X=2.2
(2)2(X+X+0.5)=9.8
2x+2x+1=9.8
4x+1-1=9.8-1
4x=8.8
4x÷4=8.8÷4
X=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
(5)X-0.8X=6
0.2x=6
0.2x÷0.2=6÷0.2
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
x=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
13
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
14
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
15
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
16
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
17
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
5
x=20
4
5
x÷
4
5
=20÷
4
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
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
4
=7
X-
3
4
+
3
4
=7+
3
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
19
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
20
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
21
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
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