1003*997
=(1000+3)×(1000-3)
=1000 000-9
=999 991
2008的平方-2007的平方
=(2008+2007)×(2008-2007)
=4015
利用因式分解计算1003*997 2008的平方-2007的平方
利用因式分解计算1003*997 2008的平方-2007的平方
数学人气:567 ℃时间:2020-03-26 22:13:37
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