已知x2-6x+8y+y2+25=0,求2x+3y的值
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已知x2-6x+8y+y2+25=0,求2x+3y的值
![已知x2-6x+8y+y2+25=0,求2x+3y的值](/uploads/image/z/16709887-55-7.jpg?t=%E5%B7%B2%E7%9F%A5x2-6x%2B8y%2By2%2B25%3D0%2C%E6%B1%822x%2B3y%E7%9A%84%E5%80%BC)
x2-6x+8y+y2+25=0
(x²-6x+9)+(y²+8y+16)=0
(x-3)²+(y+4)²=0
x-3=0,y+4=0
x=3,y=-4
2x+3y=6-12=-6
(x²-6x+9)+(y²+8y+16)=0
(x-3)²+(y+4)²=0
x-3=0,y+4=0
x=3,y=-4
2x+3y=6-12=-6
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