问题 解答题
计算下面各题,能简算的要简算.
2
3
+
1
6
+
5
18
7
11
+
4
9
+
4
11
+
5
9
5
6
+
1
4
-
2
3
1
2
+(
4
5
-
2
3
10-
5
7
-
2
7
5
6
-(
1
2
-
1
3
7
8
-(
7
8
-
1
2
9
10
-(
1
6
+
2
5
答案

(1)

2
3
+
1
6
+
5
18

=

12
18
+
3
18
+
5
18

=

15
18
+
5
18

=

10
9

(2)

7
11
+
4
9
+
4
11
+
5
9

=(

7
11
+
4
11
)+(
4
9
+
5
9
),

=1+1,

=2;

(3)

5
6
+
1
4
-
2
3

=

5
6
-
2
3
+
1
4

=

1
6
+
1
4

=

5
12

(4)

1
2
+(
4
5
-
2
3
),

=

1
2
+
2
15

=

19
30

(5)10-

5
7
-
2
7

=10-(

5
7
+
2
7
),

=10-1,

=9;

(6)

5
6
-(
1
2
-
1
3
),

=

5
6
-
1
6

=

2
3

(7)

7
8
-(
7
8
-
1
2
),

=

7
8
-
7
8
+
1
2

=0+

1
2

=

1
2

(8)

9
10
-(
1
6
+
2
5
),

=

9
10
-
1
6
-
2
5

=

9
10
-
2
5
-
1
6

=

1
2
-
1
6

=

1
3

解答题
单项选择题