问题 解答题
计算(能简便的要简便)
5
6
+
3
4
-
1
3
5
6
+
4
9
+
5
9
1
2
+(
2
3
-
1
4
3-(
9
14
+
6
7
7
11
+
1
5
+
4
11
+
2
5
9
10
-(
3
4
-
1
6
答案

(1)

5
6
+
3
4
-
1
3

=

19
12
-
1
3

=1

1
3

(2)

5
6
+
4
9
+
5
9

=

5
6
+(
4
9
+
5
9
),

=

5
6
+1,

=1

5
6

(3)

1
2
+(
2
3
-
1
4
),

=

1
2
+
5
12

=

11
12

(4)3-(

9
14
+
6
7
),

=3-

21
14

=1

1
2

(5)

7
11
+
1
5
+
4
11
+
2
5

=(

7
11
+
4
11
)+(
1
5
+
2
5
),

=1+

3
5

=1

3
5

(6)

9
10
-(
3
4
-
1
6
),

=

9
10
-
7
12

=

19
60

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