x-3xy=—5,xy+y=3,求x-2xy+y的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知y=3xy+x,求代数式2x+5xy-2y/x-2xy-y的值(xy≠0)
已知:x+y=—3,xy=2,求-2(xy-3x)-2(2y-xy)的值
已知,xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值
已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值.
已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.