问题 解答题
(1)
3
10
7
15

(2)30:18
(3)
5
12
:0.8.
答案

(1)

3
10
7
15
=
3
10
÷
7
15
=
3
10
×
15
7
=
15
14

(2)30:18=30÷18=

30
18
=
5
3

(3)

5
12
:0.8=
5
12
8
10
=
5
12
4
5
=
5
12
÷
4
5
=
5
12
×
5
4
=
25
48

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