问题 解答题
解方程.
4
5
X=40
4
7
=
9
10
5
12
X-2=3.
答案

(1)

4
5
x=10,

4
5
x÷
4
5
=10÷
4
5

x=12.5;

(2)X÷

4
7
=
9
10

4
7
×
4
7
=
9
10
×
4
7

x=

18
35

(3)

5
12
X-2=3,

5
12
X-2+2=3+2,

5
12
5
12
=5÷
5
12

x=12.

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