若9x^2+y^2+24x-6y+25=0,则xy=
1个回答
9x^2+y^2+24x-6y+25=0,
9x^2+24x+16+y^2-6y+9=0,
(3x+4)^2+(y-3)^2=0
3x+4=0,y-3=0
x=-4/3,y=3,
xy=-4
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