问题 解答题
用简便方法计算
37×20.2
1.25×3.2×2.520÷0.4÷2.5.
答案

(1)37×20.2,

=37×(20+0.2),

=37×20+37×0.2,

=740+7.4,

=747.4;

(2)1.25×3.2×2.5,

=1.25×8×0.4×2.5,

=(1.25×8)×(0.4×2.5),

=10×1,

=10;

(3)20÷0.4÷2.5,

=20÷(0.4×2.5),

=20÷1,

=20.

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