999的平方减1002乘以998等于什么?
999的平方减1002乘以998等于什么?
数学人气:721 ℃时间:2019-11-06 23:03:01
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999²-1002×998=999²-(1000+2)(1000-2)=999²-(1000²-2²)=999²-1000²+2²=(999+1000)(999-1000)+2²=1999×(-1)+4=-1999+4=-1995
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