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99X45十99X56一99简便方法

99x56 十56 =56x(99+1) =56x100 =5600 祝天天向上。

125x56 =125x8x7 =1000x7 =7000 99x65十165 =99x6

99x56+56 =(99+1)x56 =100x56 =5600

99又656/657x453 =(100-1/657)x453 =100x453-1/657x4

如图所示望采纳

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