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