已知2x-|y|=-7,3|x|+2y=0,则xy=?
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
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x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
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-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)