x2-2x+6y+10=0 求x,y及3x-2y的值
2个回答
x^2-2x+y^2+6y+10=0
(x^2-2x+1)+(y^2+6y+9)=0
(x-1)^2+(y+3)^2=0
x=1 y=-3
3x-2y=3+6=9
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