问题
解答题
计算下面各题,能简算的要简算. 25×32×125 87×
99×
(1-
|
答案
(1)25×32×125,
=25×(4×8)×125,
=(25×4)×(125×8),
=100×1000,
=100000;
(2)87×
,3 86
=(86+1)×
,3 86
=86×
+1×3 86
,3 86
=3+
,3 86
=3
;3 86
(3)
×5 7
+7 24
÷1 5
,4 5
=
+5 24
,1 4
=
;11 24
(4)
×9+2 5
,2 5
=
×(9+1),2 5
=
×10,2 5
=4;
(5)99×
+2 7
×99,5 7
=99×(
+2 7
),5 7
=99×1,
=99;
(6)(1-
×80)÷1 100
,2 7
=(1-
)×4 5
,7 2
=
×1 5
,7 2
=
.7 10