aa+bb-4a+2b+5=0 ab=?
问题描述:
aa+bb-4a+2b+5=0 ab=?
答
(a-2)^2+(b+1)^2=0
a=2 b=-1
ab=-2
aa+bb-4a+2b+5=0 ab=?
(a-2)^2+(b+1)^2=0
a=2 b=-1
ab=-2