问题 解答题
解方程
(1)2÷x=
16
5
(2)
3
4
x+
1
10
x=
7
5
(3)2x-
4
5
x=1.2
(4)(1-60%)x=28.
答案

(1)2÷x=

16
5

2÷x×x=

16
5
x,

16
5
x=2,

16
5
16
5
=2÷
16
5

x=

5
8

(2)

3
4
x+
1
10
x=
7
5

3
4
+
1
10
)x=
7
5

17
20
x=
7
5

17
20
x÷
17
20
=
7
5
÷
17
20

x=

28
17

(3)2x-

4
5
x=1.2,

(2-

4
5
)x=1.2,

6
5
x=1.2,

6
5
x÷
6
5
=1.2÷
6
5

x=1;

(4)(1-60%)x=28,

40%x=28,

40%x÷40%=28÷40%,

x=70.

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