问题 解答题
怎样简便就怎样算
[
1
2
-(
3
4
-
3
5
)]÷
7
10
1
5
+
2
7
÷
3
7
1
2
×
2
5
+
9
10
÷
9
20
1
3
÷(
2
3
-
2
5
)×
3
5
11
12
-
3
4
)÷(2-
1
2
) 
5
9
×
3
10
+
2
7
÷
2
5
答案

[
1
2
-(
3
4
-
3
5
)]÷
7
10

=[

1
2
-
3
20
]÷
7
10

=

7
20
÷
7
10

=

1
2

1
5
+
2
7
÷
3
7

=

1
5
+
2
3

=

13
15

1
2
×
2
5
+
9
10
÷
9
20

=

1
5
+2,

=2

1
5

1
3
÷(
2
3
-
2
5
)×
3
5

=

1
3
÷
4
15
×
3
5

=

3
4

11
12
-
3
4
)÷(2-
1
2
),

=

1
6
×
2
3

=

1
9

5
9
×
3
10
+
2
7
÷
2
5

=

1
6
+
5
7

=

37
42
 

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