问题 解答题
怎样简便就怎样计算
①1.25×1.4×8②15-1.7-1.3③7×0.2×1.5
④32.2×4+17.8×4⑤10.1×87⑥47.2÷4÷5.9.
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.

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