xy=-2,x+y=3 求(3xy+10y)+[5x-(2xy+2y-3x)]的运算过程和结果是什么
xy=-2,x+y=3 求(3xy+10y)+[5x-(2xy+2y-3x)]的运算过程和结果是什么
已知x+y=2 xy=3 2[xy+(-3x)]-3(2y-xy)的运算过程和结果是什么
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
若x+y-5xy=0,求(2x-3xy+2y)/(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xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.
已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知3x=xy+3y,求2x+xy-2y/y-x-xy的值