问题
解答题
计算,能用简便方法的用简便方法.
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答案
(1)101×5.8,
=(100+1)×5.8,
=100×5.8+5.8,
=580+5.8,
=585.8;
(2)0.25×12.8×0.4,
=0.25×0.4×12.8,
=0.1×12.8,
=1.28;
(3)0.27×7.2+0.27×2.8,
=0.27×(7.2+2.8),
=0.27×10,
=2.7;
(4)2.35×0.15-0.15×0.35,
=0.15×(2.35-0.35),
=0.15×2,
=0.3.