已知x^2-2x+y^2-4y+5=0,求(2x-3y)^2
2个回答
x²-2x+1+y²-4y+4=0
(x-1)²+(y-2)²=0
∴x-1=0
y-2=0
∴x=1
y=2
∴(2x-3y)²
=(2-6)²
=16
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