问题 解答题
算一算.(要写出主要过程)
7
9
-
2
3
+
1
6

3
4
-(
11
12
-
1
2
)

7
8
+
3
4
+
1
8
答案

(1)

7
9
-
2
3
+
1
6

=

1
9
+
1
6

=

5
18

(2)

3
4
-(
11
12
-
1
2
),

=

3
4
-
5
12

=

1
3

(3)

7
8
+
3
4
+
1
8

=

7
8
+
1
8
+
3
4

=1+

3
4

=1

3
4

解答题
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