a+2002x+2001,b=2002x+2002,c=2002x+2003,问a平方+b平方+c平方+ab+ac+bc=?【速】
是a=2002x+2001
人气:248 ℃ 时间:2019-11-13 03:01:27
解答
(b-a)^2=1 (c-b)^2=1 (c-a)^2=4
a平方+b平方+c平方+ab+ac+bc
=1/2[(b-a)^2+(c-b)^2+(c-a)^2]
=1/2*6
=3
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