问题 解答题
能简算要简算.
7
8
-
5
12
+
1
6

10-
1
4
-
3
4

5
8
+(
2
3
-
5
8
答案

(1)

7
8
-
5
12
+
1
6

=

21
24
-
10
24
+
4
24

=

11
24
+
4
24

=

5
8

(2)10-

1
4
-
3
4

=10-(

1
4
+
3
4
),

=10-1,

=9;

(3)

5
8
+(
2
3
-
5
8
),

=

5
8
-
5
8
+
2
3

=0+

2
3

=

2
3

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