x²+5y²-4xy+6y+9=0,求x²+y²
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x²+5y²-4xy+6y+9=0,求x²+y²
x²+5y²-4xy+6y+9=0,求x²+y²
x²+5y²-4xy+6y+9=0,求x²+y²
x²+5y²-4xy+6y+9=0
﹙x²-4xy+4y²﹚+﹙y²+6y+9﹚=0
﹙x-2y﹚²+﹙y+3﹚²=0
x-2y=0,y+3=0
x=-6,y=-3
x²+y²=36+9=45
x²+5y²-4xy+6y+9=0
x²-4xy+4y²+y²+6y+9=0
(x-2y)²+(y+3)²=0
所以:
x-2y=0
y+3=0
解得:
x=-6
y=-3
x²+y²=36+9=45
(y+3)²+(x+2y)²=0 y=-3 x=6 45谢谢
x^2+y^2-2x-6y=-10 x^2+y^2-2x-6y+10=0 x^2-2x+1+y^2-6y+9=0 (x-1)^2+(y-3)^2=0 x-1=0 x=1 y-3=0 y=3 x^2005y^