x²-2x+8y+y²+17=0,求x-2y的值还有已知a、b、c满足a-b=8,ab+c²+16=0,求a+b-c的值
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x²-2x+8y+y²+17=0,求x-2y的值还有已知a、b、c满足a-b=8,ab+c²+16=0,求a+b-c的值
x²-2x+8y+y²+17=0,求x-2y的值
还有
已知a、b、c满足a-b=8,ab+c²+16=0,求a+b-c的值
x²-2x+8y+y²+17=0,求x-2y的值还有已知a、b、c满足a-b=8,ab+c²+16=0,求a+b-c的值
x²-2x+8y+y²+17=0,
x²-2x+1+y²+8x+16=0
(x-1)²+(y+4)²=0
x-1=0,y+4=0
x=1,y=-4
则x-2y=1+8=9
x²-2x+8y+y²+17=0
x²-2x+1+8y+y²+16=0
(x-1)^2+(y+4)^2=0
x-1=0,x=1
y+4=0,y=-4
x-2y=1-2X(-4)=1+8=9
x²-2x+8y+y²+17=0
(x²-2x+1)+(y²+8y+16)=0
(x-1)²+(y+4)²=0
x-1=0 y+4=0
∴x=1 y=-4
x-2y=1+8=9
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