若x+y=3,xy=2,则(-5x+2)-(3xy+5y)的值为
xy=-1,x+y=2,则(xy-2y)+3x+5y的值为
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知1/x=1/y+3,则(5x+xy-5y)/(x-xy-y)的值为( )
已知xy/x+y=2,则代数式3x-5y+8y/-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^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知x-y=3,xy=5则代数式(3x-4y+5xy)-(2x-3y)+5xy的值是
已知x-y=3,xy=5,则代数式(3x-4y+5xy)-(2x-3y)+5xy的值是?
若(3xy+2)+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为