作业帮2001²-2001×1999
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2001²-2001×1999
2001²-2001×1999
2001²-2001×1999
2001²-2001×1999
=2001*2001-2001*1999
=2001*(2001-1999)
=2001*2
=4002
2001²-2001×1999
=2001×(2001-1999)
=2001×2
=4002
答：
2001²-2001×1999
=2001×(2001-1999)
=2001×2
=4002
2001²-2001×1999
=2001×(2001-1999)
=2001×2
=4002