问题 解答题
计算,能简便的要简便计算:
11
10
-
2
7
-
5
7
1-
5
8
-
3
8
5
6
+(
2
3
-
2
15
2
5
-
1
3
+
3
5
1
2
-(
3
4
-
3
8
答案

(1)

11
10
-
2
7
-
5
7

=

11
10
-(
2
7
+
5
7
),

=1

1
10
-1,

=

1
10

(2)1-

5
8
-
3
8

=1-(

5
8
+
3
8
),

=1-1,

=0;

(3)

5
6
+(
2
3
-
2
15
),

=

5
6
-
8
15

=

25
30
-
16
30

=

9
30

=

3
10

(4)

2
5
-
1
3
+
3
5

=

2
5
+
3
5
-
1
3

=1-

1
3

=

2
3

(5)

1
2
-(
3
4
-
3
8
),

=

1
2
-
3
8

=

4
8
-
3
8

=

1
8

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