问题 解答题

用简便方法计算

①25×1.25×32

②(3.75-2.9+2.25)÷31%

答案

①25×1.25×32,

=25×1.25×4×8,

=(25×4)×(1.25×8),

=100×10,

=1000;

②(3.75-2.9+2.25)÷31%,

=(3.75+2.25-2.9)÷31%,

=(6-2.9)÷0.31,

=3.1÷0.31,

=10.

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