已知x2-7xy+12y2=0,x,y均不为0,求x+y/x-y的值
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已知x2-7xy+12y2=0,x,y均不为0,求x+y/x-y的值已知x2-7xy+12y2=0,x,y均不为0,求x+y/x-y的值已知x2-7xy+12y2=0,x,y均不为0,求x+y/x-y
已知x2-7xy+12y2=0,x,y均不为0,求x+y/x-y的值
已知x2-7xy+12y2=0,x,y均不为0,求x+y/x-y的值
已知x2-7xy+12y2=0,x,y均不为0,求x+y/x-y的值
∵x²-7xy+12y²=0
(x-3y)(x-4y)=0
∴x-3y=0 x-4y=0
x1=3y
x2=4y
当x=3y时 (x+y)/(x-y)=(3y+y)/(3y-y)=4y/2y=2
当x=4y时 (x+y)/(x-y)=(4y+y)/(4y-y)=5y/3y=5/3
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