问题
解答题
脱式计算,能简算的一定要简算.
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答案
(1)1.25×16
=1.25×8×2,
=10×2,
=20;
(2)7.6×0.5-0.05
=3.8-0.05,
=3.75;
(3)12.8×10.1
=12.8×(10+0.1),
=12.8×10+12.8×0.1,
=128+1.28,
=129.28.
(4)8.75×0.25×0.4
=8.75×(0.25×0.4),
=8.75×0.1,
=0.875.