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
; 15-5÷12-1 12
. 7 12
答
(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.