脱式计算.(友情提醒:有的可以简算) 4000-3456÷32×5 3.68-3.6×0.2+0.18 48×9.9+48×0.1 (1-3/4)÷0.25×4 (6-6×2/3)÷12 2÷[7/12+( 5/6-5/12)].
问题描述:
脱式计算.(友情提醒:有的可以简算) 4000-3456÷32×5 | 3.68-3.6×0.2+0.18 | 48×9.9+48×0.1 | ||||||||||
(1-
| (6-6×
| 2÷[
|
答
(1)4000-3456÷32×5,
=4000-108×5,
=4000-540,
=3460;
(2)3.68-3.6×0.2+0.18,
=3.68+0.18-0.72,
=3.86-0.72,
=3.14;
(3)48×9.9+48×0.1,
=48×(9.9+0.1),
=48×10,
=48;
(4)(1-
)÷0.25×4,3 4
=
÷1 4
×4,1 4
=1×4,
=4;
(5)(6-6×
)÷12,2 3
=(6-4)÷12,
=2÷12,
=
;1 6
(6)2÷[
+(7 12
−5 6
)],5 12
=2÷[
+(7 12
-10 12
)],5 12
=2÷[
+7 12
],5 12
=2÷1,
=2.