已知x+y=-5,xy=3,求(x-y)²的值
已知x+y=-5,xy=3,求(x-y)²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=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知x-y=6,xy=-2,求3(xy+x-2y)-5(y-2x)+2(xy-x)的值.
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
已知x+y=5,xy=2,求5x+4y-3y-2y+xy的值