题干

用简便方法计算下列各题

3.6×0.25

99×1.83+1.83  

12.5×0.78×0.8

3.67÷0.25÷40.

上一题 下一题 0.0难度 选择题 更新时间:2014-07-08 07:43:13

答案(点此获取答案解析)

解:①3.6×0.25

=0.9×4×0.25

=0.9×(4×0.25)

=0.9×1

=0.9

②99×1.83+1.83

=1.83×(99+1)

=1.83×100

=183

③12.5×0.78×0.8

=12.5×0.8×0.78

=10×0.78

=7.8

④3.67÷0.25÷40

=3.67÷(0.25×40)

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