【試題】計(jì)算98766×98768-98765×98769
【分析】:將乘數(shù)進(jìn)行拆分后可以利用乘法分配律,將98766拆成(98765+1),將98769拆成(98768+1),這樣就保證了減號(hào)兩邊都有相同的項(xiàng)。
解:98766×98768-98765×98769
=(98765+1)×98768-98765×(98768+1)
=98765×98768+98768-(98765×98768+98765)
=98765×98768+98768-98765×98768-98765
=98768-98765
=3