如题所述
125x99
=125x100-125
=12500-125
=12375
59x99
=59x100-59
=5900-59
=5841
=125x100-125
=12500-125
=12375
59x99
=59x100-59
=5900-59
=5841
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第1个回答 2016-11-16
简便方法125×99=125×（100-1）=125×100-125=12500-125=12375
59x99=（60-1）（100-1）=60×100-100-60+1=6000-160+1=5841
59x99=（60-1）（100-1）=60×100-100-60+1=6000-160+1=5841
