3x^2+4xy--4y^2=0 (x≠0,y≠0),求9x^2-3xy∕18x^2+y^2的值
已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y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+3xy-4y^2=0(y≠0),求x-y/x+y的值.
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值
已知y=3xy+x,求代数式2x+5xy-2y/x-2xy-y的值(xy≠0)
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知3x^2-xy-4y^2=0(x≠y)求x/y的值
(1)已知x-y=6,xy=4,求xy^-1+x^-1y的值; (2)已知x^2+y^2=3xy且xy≠0,求x^2y^