问题
解答题
计算下面各题,能用简便算法的要用简便法计算.
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答案
(1)0.25×8.75×4,
=0.25×4×8.75,
=100×8.75,
=875;
(2)25.8×7+3×25.8,
=25.8×(7+3),
=25.8×10,
=258;
(3)10÷0.2÷2.5,
=10÷(0.2×2.5),
=10÷0.5,
=20;
(4)21.36÷0.8-12.9,
=26.7-12.9,
=13.8.