知识大全 (1)4÷23x=25(2)8(x-2)=2(x+7)(3)320:18%=6.5x.

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解方程,我没问题!(1)4÷23x=25(2)8(x-2)=2(x+7)(3)320:18%=6.5x.

(1)方程变形得:

4
15

x=4,
解得:x=15;

(2)去括号得:8x-16=2x+14,
移项合并得:6x=30,
解得:x=5;

(3)方程变形得:

3
20

×

100
18

=

6.5
x

,即

5
6

=

6.5
x


解得:x=7.8,
经检验x=7.8是分式方程的解.

解方程,我没问题!4÷X=25 8(x-2)=2(x+7) 320:18%=6.5x.

(1)4÷X=

2
5


      4÷X×X=

2
5

X,

2
5

X=4,

2
5

2
5

=4÷

2
5


            X=10;

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

(3)

3
20

:18%=

6.5
X

3
20

X=0.18×6.5,

3
20

X=1.17,
           X=7.8.

解方程,我没问题!4÷23X=25 8(x-2)=2(x+7...

(1)4÷

2
3

x=

2
5


    4÷

2
3

2
3

x=

2
5

×

2
3

x,

4
15

x=4,

4
15

15
4

=4×

15
4


               x=15;

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

(3)

3
20

:18%=

6.5
x

3
20

x=18%×6.5,

3
20

20
3

=1.17×

20
3


            x=7.8.

解方程,我没问题!4÷ 2 3 X= 2 5 8(x-2)=2(x+7) 3 20 :18%=

(1) 4÷
2
3
x=
2
5


2
3

2
3

x=

2
5

×

2
3

x ,

4
15

x=4 ,

4
15

15
4

=4×

15
4


x=15;

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

(3)

3
20

:18%=

6.5
x

3
20

x=18%×6.5 ,

3
20

20
3

=1.17×

20
3


x=7.8.

解方程,我没问题X:25= 2 5 5X-5× 1 3 =0.88(X-2)=2(X+7)

(1)X:25=
2
5

5x=25×2,
5x÷5=50÷5,
x=10;

(2)5x-5×

1
3

=0.8,
5x-

5
3

=0.8,
5x-

5
3

+

5
3

=0.8 +

5
3


5x÷5=

37
15

÷ 5,
x=

37
75

(3)8(x-2)=2(x+7),
8x-16=2x+14,
8x-16-2x=2x+14-2x,
6x-16+16=14+16,
6x÷6=30÷6,
x=5.

解方程: 6÷23X=35 8(X-2)=2(X+7) 4X?83X+8=45

(1)6÷

2
3

X=

3
5


  6÷

2
3

2
3

X=

3
5

×

2
3

X,

2
3

3
5

=6,

2
5

X=6,

2
5

2
5

=6÷

2
5


           X=15;

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

(3)

4X?8
3X+8

4
5


   5(4X-8)=4(3X+8),
      20X-40=12X+32,
  20X-40-12X=12X+32-12X,
       8X-40=32,
    8X-40+40=32+40,
          8X=72,
       8X÷8=72÷8,
           X=9.

解方程,我没问题!①x- 2 9 x=21② 3 20 :18%= 6.5 x .

①x-
2
9
x=21,
(1-
2
9

)x=21,

7
9

x=21,

7
9

9
7

=21×

9
7


x=27;

3
20

:18%=

6.5
x

3
20

x=18%×6.5,

3
20

x=1.17,

3
20

20
3

=1.17×

20
3


x=7.8.

解方程,我没问题X:25= 2 5 5X-5× 1 3 =0.8 X 8

(1)X:25=
2
5

5x=25×2,
5x÷5=50÷5,
x=10;

(2)5X-5×

1
3

=0.8,
5x-

5
3

+

5
3

=0.8+

5
3


5x÷5=

37
15

÷5,
x=

37
75

(3)

X
8

-4.5+5.5=10,

X
8

-4.5+5.5+4.5-5.5=10+4.5-5.5,

X
8

×8=9×8,
X=72.

解方程,我没问题!x-25%x=24 3 4 x- 4 5 +0.2= 1 2

(1)x-25%x=24,
75%x=24,
75%x÷75%=24÷75%,
x=32;(2)
3
4

x-

4
5

+0.2=

1
2

3
4

x-0.6=

1
2

3
4

x-0.6+0.6=

1
2

+0.6,

3
4

x=

11
10

3
4

3
4

=

11
10

÷

3
4


x=1

7
15

解方程 75%x- 1 2 x=1 7 8 ×6 6(x-2)=4(x+7),x:12= 3 20 :18

(1)75%x-
1
2
x=1
7
8

×6,
25%x=

45
4


25%x÷25%=

45
4

÷25%,
x=45;

(2)6(x-2)=4(x+7),
6x-6×2=4x+4×7,
6x-12=4x+28,
6x-12+12=4x+28+12,
6x=4x+40,
6x-4x=4x+40-4x,
2x=40,
2x÷2=40÷2,
x=20;

(3)x:12=

3
20

:18%,
18%x=12×

3
20


18%x=1.8,
18%x÷18%=1.8÷18%,
x=10.

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