问题 解答题
3
7
×
1
13
×
91
9
1
33
×22×
3
4
10×
7
15
×
9
28
答案

(1)

3
7
×
1
13
×
91
9

=

3
91
×
91
9

=

1
3

(2)

1
33
×22×
3
4

=

2
3
×
3
4

=

1
2

(3)10×

7
15
×
9
28

=10×(

7
15
×
9
28
),

=10×

3
20

=

3
2

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