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五年级上册解方程练习题

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

(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

(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

  1. (x-140)÷70=4

(40) 20-9x=2

(41) x+19.8=25.8

(42) 5.6x=33.6

(43) 9.8-x=3.8

(44) 75.6÷x=12.6

(45) 5x+12.5=32.3

(46) 5(x+8)=102

(47) x+3x+10=70

(48) 3(x+3)=50-x+3

(49) 5x+15=60

(50) 3.5-5x=2

(51) 0.3×7+4x=12.5

(52) x÷1.5-1.25=0.75

(53) 4x-1.3×6=2.6

(54) 6x+12.8=15.8

(55) 150×2+3x=690

(56) 2x-20=4

(57) 3x+6=18

(58) 2(2.8+x)=10.4

(59) (x-3)÷2=7.5

(60) 13.2x+9x=33.3

(61) 3x=x+100

(62) x+4.8=7.2

(63) 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

(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) 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-=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

(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

(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

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

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) x=20

x÷=20÷

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-=7

X-+=7+

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

  1. X=18
  2. 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

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