求99×71+71的简便运算
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求99×71+71的简便运算
求99×71+71的简便运算
求99×71+71的简便运算
99×71+71
=99×71+71×1
=(99+1)×71
=100×71
=7100
原式=99×71 71×1=71×(99 1)=7100
=(99+1)×77=100×77=7700
...........99X71+71=99X71+71X1=(99+1)X71=71X100=7100