问题 解答题
5
18
÷[(
5
7
-
1
3
)×
7
16
].
答案

5
18
÷[(
5
7
-
1
3
)×
7
16
],

=

5
18
÷[
8
21
×
7
16
],

=

5
18
÷
1
6

=

5
18
×6,

=

5
3

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