已知x+y=3,xy=-10,则|x-y|=

已知x-y=3,xy=10,则x²y-xy²= 已知x-xy=10,xy-y=2,则x-y=（ ）,-2xy+x+y=（ ）. 已知x-xy=20,xy-y=-10,则x-y=( ),x+y-2xy=( ). 已知x-xy=20,xy-y=-10,则x-y=?,x+y-2xy? 已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)= 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=? 已知x-y=3xy,则2x+3xy-2y/x-2xy-y= 已知xy/x+y=3,则代数式2x-7xy+2y/-x+xy-y的值是多少? 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y) 已知x²+xy=10,y（x+y）=15,则x+y= 已知(x+y)/(x-y)=3/2,则(x²+y²)/xy = 已知x^2-3xy+2y^2=0 则x/y+x/y= 已知x-y=5,xy=3,则3xy-7x+7y=? 已知x+y=3,xy=1,则4x+3xy+4y= 已知x+y=2,xy=3,则x²+y²-3xy=? 已知xy=-3,x+y=-4,则x²+3xy+y²=?