2001²-2000乘以2002的结果是

问题描述:

2001²-2000乘以2002的结果是

0.0

2001²-2000x2002
=(2000+1)²-2000x2002
=2000²+2x2000+1-2000x2002
=2000²+(2-2002)x2000+1
=2000²-2000²+1
=0+1
=1