问题
解答题
下面各题,你有简便的方法解决吗?
75×205+6.25×205
125.46-8.23-1.7
6.9+7.1×10
12.5×3.2×250.
答案
(1)75×205+6.25×205
=(75+6.25)×205
=81.25×205
=16656.25;
(1)125.46-8.23-1.7
=125.46-(8.23+1.7)
=125.46-9.93
=115.53;
(3)6.9+7.1×10
=6.9+71
=77.9;
(4)12.5×3.2×250
=(12.5×0.8)×(4×250)
=10×1000
=10000.