题目内容

计算.
5
7
×
2
3
×
14
15
=
2
9
×
3
20
×9
=
7
12
×
3
4
×
2
21
=
6
7
×
2
15
×
5
8
=
(1)
5
7
×
2
3
×
14
15

=
5
7
×
14
15
×
2
3

=
2
3
×
2
3

=
4
9


(2)
2
9
×
3
20
×9

=
2
9
×9×
3
20

=2×
3
20

=
3
10


(3)
7
12
×
3
4
×
2
21

=
7
12
×
2
21
×
3
4

=
1
18
×
3
4

=
1
24


(4)
6
7
×
2
15
×
5
8

=
6
7
×(
2
15
×
5
8

=
6
7
×
1
12

=
1
14
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