题目内容

【题目】用简便方法计算。

4×0.8×2.5×12.5

0.65×14+87×0.65-0.65

42÷[14-(50-39)]

2.25×4.8+77.5×0.48

【答案】100,65,14,48

【解析】

解:4×0.8×2.5×12.5

=(4×2.5)×(0.8×12.5

=10×10

=100

0.65×14+87×0.65-0.65

=0.65×14+87×0.65-0.65×1

=0.65×(14+87-1

=0.65×100

=65

42÷[14-(50-39)]

=42÷[14-11]

=42÷3

=14

2.25×4.8+77.5×0.48

=2.25×4.8+7.75×4.8

=(2.25+7.75)×4.8

=10×4.8

=48

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