问题 填空题
计算:[2
3
5
-(8.5-2
2
3
)÷3.5]×7
1
2
=______.
答案

[2

3
5
-(8.5-2
2
3
)÷3.5]×7
1
2
=

=[

13
5
-(
17
2
-
8
3
÷
7
2
15
2

=[

13
5
-
35
6
×
2
7
15
2

=[

13
5
-
5
3
15
2

=

13
5
×
15
2
-
5
3
×
15
2

=

39
2
-
25
2

=7.

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