问题 解答题
解方程
6
7
x=
8
21
4
5
=
15
16
x-28%x=29.52(1-25%)x=15.
答案

(1)

6
7
x=
8
21

6
7
x÷
6
7
=
8
21
÷
6
7

x=

4
9

(2)x÷

4
5
=
15
16

x÷

4
5
×
4
5
=
15
16
×
4
5

x=

3
4

(3)x-28%x=29.52,

72%x=29.52,

72%x÷72%=29.52÷72%,

x=41;

(4)(1-25%)x=15,

75%x=15,

75%x÷75%=15÷75%,

x=20.

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