问题 解答题
用简便方法计算下面各题.
①25×32×1.25②0.25×39+0.25③36×8.7+3.6×13.
答案

①25×32×1.25,

=(25×4)×(8×1.25),

=100×10,

=1000;

②0.25×39+0.25,

=0.25×(39+1),

=0.25×40,

=10;

③36×8.7+3.6×13,

=36×8.7+36×1.3,

=36×(8.7+1.3),

=36×10,

=360.

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