问题
解答题
计算(能简便的要简便) 40÷[(
85×0.75+15×75%
7.85-1.89-2.11+2.15 [1-(
24×(
|
答案
(1)40÷[(
-3 4
)×3]1 3
=40÷[
×3],5 12
=40÷
,5 4
=32;
(2)85×0.75+15×75%
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75;
(3)
÷[9 10
+(1-2 5
)]10 11
=
÷[9 10
+2 5
],1 11
=
÷9 10
,27 55
=
;11 6
(4)7.85-1.89-2.11+2.15
=7.85+2.15-(1.89+2.11),
=10-4,
=6;
(5)[1-(
+1 2
)]÷1 6 1 3
=[1-
]÷2 3
,1 3
=
÷1 3
,1 3
=1;
(6)24×(
+1 4
-1 8
)1 6
=24×
+24×1 4
-24×1 8
,1 6
=6+3-4,
=5.