50道解方程带答案

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(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=1.3

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

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)

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

X=11

(49)

5x+15=60

5x+15-15=60-15

5x=45

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

X=0.3

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