已知实数x y 满足x^2+y^2-xy+2x-y+1=0,试求x y 的值??
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x^2+y^2-xy+2x-y+1=0
x^2+2x+1-y(x+1)+y^2=0
(x+1)^2-y(x+1)+y^2=0
(x+1-y/2)^2+3y^2/4=0
则y=0,x+1-y/2=0,x=-1
即x=-1,y=0,4,x=-1
y=0,2,x^2+y^2-xy+2x-y+1=0
x^2+2x+1-y(x+1)+y^2=0
(x+1)^2-y(x+1)+y^2=0
(x+1-y/2)^2+3y^2/4=0
则y=0,x+1-y/2=0,x=-1
即x=-1,y=0
(x+1-y/2)^2+3y^2/4=0 就是配方得出来的,配上而此项系数的平方,2,x=-1,y=0,0,x^2+y^2-xy+2x-y+1=0
x^2+2x+1-y(x+1)+y^2=0
(x+1)^2-y(x+1)+y^2=0
(x+1-y/2)^2+3y^2/4=0
所以y=0,x+1-y/2=0,
得x=-1
最后为x=-1,y=0,0,
x^2+2x+1-y(x+1)+y^2=0
(x+1)^2-y(x+1)+y^2=0
(x+1-y/2)^2+3y^2/4=0
则y=0,x+1-y/2=0,x=-1
即x=-1,y=0,4,x=-1
y=0,2,x^2+y^2-xy+2x-y+1=0
x^2+2x+1-y(x+1)+y^2=0
(x+1)^2-y(x+1)+y^2=0
(x+1-y/2)^2+3y^2/4=0
则y=0,x+1-y/2=0,x=-1
即x=-1,y=0
(x+1-y/2)^2+3y^2/4=0 就是配方得出来的,配上而此项系数的平方,2,x=-1,y=0,0,x^2+y^2-xy+2x-y+1=0
x^2+2x+1-y(x+1)+y^2=0
(x+1)^2-y(x+1)+y^2=0
(x+1-y/2)^2+3y^2/4=0
所以y=0,x+1-y/2=0,
得x=-1
最后为x=-1,y=0,0,
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