已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)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xy/x+y=6,求3x-2xy+3y/-x+3xy-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
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值
已知X+Y=6,xy=3求代数式(5XY+4X+7Y)+(6X-3XY)-(4XY-3Y)的值
已知x+y=3,xy=1,求代数式5xy+4x+7y+6x-3xy-4xy+3y的值.
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知xy^2=-3,求-xy(x^3y^7-3x^2y^5-y)的值