已知a²+b²+2a-4b+5=0,则a²-2ab-3b²/a(a-b)+3ab+b²的值为?
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已知a²+b²+2a-4b+5=0,则a²-2ab-3b²/a(a-b)+3ab+b²的值为?
已知a²+b²+2a-4b+5=0,则a²-2ab-3b²/a(a-b)+3ab+b²的值为?
已知a²+b²+2a-4b+5=0,则a²-2ab-3b²/a(a-b)+3ab+b²的值为?
a²+b²+2a-4b+5=0
a^2+2a+1+b^2-4b+4=0
(a+1)^2+(b-2)^2=0
则a+1=0
b-2=0
的a=-1,b=2
则
a²-2ab-3b²/a(a-b)+3ab+b²
=(a²-2ab-3b²)/(a^2+2ab+b²)
=(a²-2ab+b^2-4b²)/(a+b)^2
=((a-b)^2-4b²)/(a+b)^2
=(-1-2)^2-4*2^2/(-1+2)^2
=(9-16)/1
=-7