问题 解答题
(1)x-
3
5
x=
3
5
(2)20%x+1.5=23(3)1.5x+20%x=5.95
(4)4.8:x=3.2:24(5)
7
9
2
9
=x:
2
5
(6)(x-2)×3=0.18.
答案

(1)x-

3
5
x=
3
5

(1-

3
5
)x=
3
5

2
5
x=
3
5

2
5
2
5
=
3
5
÷
2
5

x=

3
5
×
5
2

x=

3
2

(2)20%x+1.5=23,

0.2x+1.5-1.5=23-1.5,

0.2x=21.5,

0.2x÷0.2=21.5÷0.2,

x=107.5;

(3)1.5x+20%x=5.95,

(1.5+0.2)x=5.95,

1.7x=5.95,

1.7x÷1.7=5.95÷1.7,

x=3.5;

(4)4.8:x=3.2:24,

3.2x=4.8×24,

3.2x=115.2,

3.2x÷3.2=115.2÷3.2,

x=36;

(5)

7
9
2
9
=x:
2
5

7:2=x:

2
5

2x=7×

2
5

2x=

14
5

2x÷2=

14
5
÷2,

x=

14
5
×
1
2

x=

7
5

(6)(x-2)×3=0.18,

3x-6=0.18,

3x-6+6=0.18+6,

3x=6.18,

3x÷3=6.18÷3,

x=2.06.

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