题目内容

合理灵活地进行计算.
7
16
÷
20
21
÷
7
12
3
4
×(
17
18
-
5
9
6×[(
5
6
+
2
3
)÷6]
3
7
×
1
15
+
4
7
÷15.

(1)
7
16
÷
20
21
÷
7
12

=
147
320
÷
7
12

=
63
80


(2)
3
4
×(
17
18
-
5
9
),
=
3
4
×
7
18

=
7
24


(3)6×[(
5
6
+
2
3
)÷6],
=6×[
3
2
÷6],
=6×
1
4

=
3
2


(4)
3
7
×
1
15
+
4
7
÷15,
=
3
7
×
1
15
+
4
7
×
1
15

=(
3
7
+
4
7
)×
1
15

=1×
1
15

=
1
15
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