99×0.625 0.625102×99用简便方法计算?

如题所述

99×0.625+0.625+102×99
=0.625×(99+1)+102×99
=0.625×100+102×99
=62.5+102×99
=62.5+(100+2)×99
=62.5+100×99+2×99
=62.5+9900+198
=9962.5+198
=10160.5
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第1个回答  2020-08-13
(100-1)×0.625