问题 解答题
计算下面各题.
9
10
-
4
5
+
2
3

1
2
-(
3
4
-
1
8
)

5
6
-(
1
2
+
1
4
)

2
7
+
5
9
+
5
7

5
6
+
1
8
+
3
8

2
9
+(
3
4
-
1
2
)
答案

(1)

9
10
-
4
5
+
2
3

=

1
10
+
2
3

=

23
30

(2)

1
2
-(
3
4
-
1
8
),

=

1
2
-
5
8

=-

1
8

(3)

5
6
-(
1
2
+
1
4
),

=

5
6
-
3
4

=

1
12

(4)

2
7
+
5
9
+
5
7

=

2
7
+
5
7
+
5
9

=1+

5
9

=1

5
9

(5)

5
6
+
1
8
+
3
8

=

5
6
+(
1
8
+
3
8
),

=

5
6
+
1
2

=

4
3

(6)

2
9
+(
3
4
-
1
2
),

=

2
9
+
1
4

=

17
36

多项选择题
单项选择题