计算下面各题,能简算的要简算. 9/10-(1/6+3/5); 11/12-5/8-3/8+1/12; 15-5÷12-7/12.

问题描述:

计算下面各题,能简算的要简算.

9
10
-(
1
6
+
3
5
);     
11
12
-
5
8
-
3
8
+
1
12
;      15-5÷12-
7
12

(1)

9
10
-(
1
6
+
3
5

=
9
10
-
23
30

=
2
15

(2)
11
12
-
5
8
-
3
8
+
1
12

=
11
12
+
1
12
-(
5
8
+
3
8

=1-1
=0;
(3)15-5÷12-
7
12

=15-
5
12
-
7
12

=15-(
5
12
+
7
12

=15-1
=14.