题目内容

能简算的要简算
3
4
×
5
7
×
8
9
1-
1
2
×
2
7
÷
3
4
4
9
÷
3
5
+
5
9
÷
3
5
[
8
15
-(
4
5
-
3
10
)]×
15
14
(1)
3
4
×
5
7
×
8
9

=
3
4
×
8
9
×
5
7

=
2
3
×
5
7

=
10
21


(2)1-
1
2
×
2
7
÷
3
4

=1-
1
7
÷
3
4

=1-
4
21

=
17
21


(3)
4
9
÷
3
5
+
5
9
÷
3
5

=
4
9
×
5
3
+
5
9
×
5
3

=(
4
9
+
5
9
)×
5
3

=1×
5
3

=
5
3


(4)[
8
15
-(
4
5
-
3
10
)]×
15
14

=[
8
15
-
1
2
15
14

=
8
15
×
15
14
-
1
2
×
15
14

=
4
7
-
15
28

=
1
28
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