用简便方法计算:12.5×6.787×1/8+1.25×678.75×0.125+0.125×533.75×1/8

原创 课堂99  2019-10-12 21:24:40  阅读 284 次 评论 0 条

问题:

用简便方法计算:12.5×6.787×1/8+1.25×678.75×0.125+0.125×533.75×1/8


解:

12.5×6.787×1/8+1.25×678.75×0.125+0.125×533.75×1/8

=1/8x(12.5×6.787+1.25×678.75+0.125×533.75)

=1/8x[12.5×(6.787+67.875+5.3375)]

=0.125x12.5x79.9995

=0.125x12.5x(80-0.0005)

=0.125x1000-0.00078125

=125-0.00078125

=124.99921875


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