问题 解答题
计算.
3
8
÷[(
1
5
+
1
4
)×
3
8
]
[
33
2
÷(3
2
5
-1
3
4
)+
5
6
3
13
答案

(1)

3
8
÷[(
1
5
+
1
4
)×
3
8
],

=

3
8
÷[
9
20
×
3
8
],

=

3
8
÷
3
8
÷
9
20

=1÷

9
20

=

20
9

(2)[

33
2
÷(3
2
5
-1
3
4
)+
5
6
3
13

=[

33
2
÷
33
20
+
5
6
3
13

=[10+

5
6
3
13

=10

5
6
×
3
13

=

5
2

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