问题 解答题
能简算的要简算:
11
12
-
3
8
+
1
8
5-
4
7
-
3
7
15
16
-(
3
16
+
1
4
4
9
+
3
10
+
5
9
+
7
10
3
14
+
3
7
+
5
14
4
7
+
3
14
+
7
14
答案

(1)

11
12
-
3
8
+
1
8

=

11
12
-(
3
8
-
1
8
),

=

11
12
-
1
4

=

2
3

(2)5-

4
7
-
3
7

=5-(

4
7
+
3
7
),

=5-1,

=4;

(3)

15
16
-(
3
16
+
1
4
),

=

15
16
-
3
16
-
1
4

=

3
4
-
1
4

=

1
2

(4)

4
9
+
3
10
+
5
9
+
7
10

=(

4
9
+
5
9
)+(
7
10
+
3
10
),

=1+1,

=2;

(5)

3
14
+
3
7
+
5
14

=

3
14
+
5
14
+
3
7

=

4
7
+
3
7

=1;

(6)

4
7
+
3
14
+
7
14

=

4
7
+(
3
14
+
7
14
),

=

4
7
+
5
7

=

9
7

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