问题 解答题
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.
答案

(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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