问题
解答题
怎样简便就怎样计算
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答案
①1.25×1.4×8,
=1.25×8×1.4,
=10×1.4,
=14;
②15-1.7-1.3,
=15-(1.7+1.3),
=15-3,
=12;
③7×0.2×1.5,
=7×(0.2×1.5),
=7×0.3,
=2.1;
④32.2×4+17.8×4,
=(32.2+17.8)×4,
=50×4,
=200;
⑤10.1×87,
=(10+0.1)×87,
=10×87+0.1×87,
=870+8.7,
=878.7;
⑥47.2÷4÷5.9,
=47.2÷(4×5.9),
=47.2÷23.6,
=2.