己知x>0,y>0,且x²+3xy-18y²=0,求x/y与﹙y-x﹚/x的值
x²-6y²=﹣xy 且x>0,y>0 求分式x+3y/x-y的值
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x^2-xy+3y^2=0 且xy不等于0 求x/y+y/x 的值
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
己知XY不等于0,且4X^2-5√3XY+3Y^2=0,求X/Y的值
己知x平方+3xy一4y平方=0(y≠0)求代数式(1)y分之x(2)x+y分之x一y
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方