问题 解答题
计算下面各题.
3
5
+
2
5
÷
1
5
5
7
×(7-
2
5
2
5
+
2
7
×
7
10
)÷
3
5
2-
6
13
÷
9
26
-
2
3
11÷
4
3
+5×
3
4
[
1
2
-(
3
4
-
3
5
)]÷
7
10
答案

(1)

3
5
+
2
5
÷
1
5

=

3
5
+2,

=2.6;

(2)

5
7
×(7-
2
5
),

=

5
7
×7-
5
7
×
2
5

=5-

2
7

=4

5
7

(3)(

2
5
+
2
7
×
7
10
)÷
3
5

=(

2
5
+
1
5
)÷
3
5

=

3
5
÷
3
5

=1;

(4)2-

6
13
÷
9
26
-
2
3

=2-

4
3
-
2
3

=2-(

4
3
+
2
3
),

=2-2,

=0;

(5)11÷

4
3
+5×
3
4

=11×

3
4
+5×
3
4

=(11+5)×

3
4

=16×

3
4

=12;

(6)[

1
2
-(
3
4
-
3
5
)]÷
7
10

=[

1
2
-
3
20
]÷
7
10

=

7
20
÷
7
10

=

1
2

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