题目内容

9
2
×
5
4
÷
9
2
×
5
4

4
7
×15-
4
7

10
21
÷[
5
6
×(1-
2
3
)].
(1)
9
2
×
5
4
÷
9
2
×
5
4

=
9
2
×
5
4
×
2
9
×
5
4

=(
9
2
×
2
9
)×(
5
4
×
5
4
),
=1×
25
16

=1
9
16

(2)
4
7
×15-
4
7

=(15-1)×
4
7

=14×
4
7

=8;
(3)
10
21
÷[
5
6
×(1-
2
3
)],
=
10
21
÷
[
5
6
×
1
3
],
=
10
21
÷
5
18

=
10
21
×
18
5

=1
5
7
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