问题 解答题
解方程.
8
9
×X=
2
3

5
6
=
9
10

7.2X-2X=41.6.
答案

(1)

8
9
×x=
2
3

8
9
×x×
9
8
=
2
3
×
9
8

x=

3
4

(2)x÷

5
6
=
9
10

x÷

5
6
×
5
6
=
9
10
×
5
6

x=0.75;

(3)7.2x-2x=41.6,

5.2x=41.6,

5.2x÷5.2=41.6÷5.2,

x=8.

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