2xy/(x^2-y2)+x/(x+y)怎么化简

化简&因式分解化简：898*902+4因式分解:1)x∧2+2xy+y∧2-x-y2)3x∧2y-6xy+3y 正整数x,y满足x2-y2=2xy,求x-y/x+y的值 整数x,y满足x2-y2=2xy,求x-y/x+y的值 正数xy满足x2-y2=2xy,求x+y分之x-y的值 (x^2-xy)y÷y-x/xy怎么做? x2-xy-2y2-x+5y-2 x2-2xy+y2+3x-3y+2． x2-xy-2y2-x+5y-2因式分解 因式分解 x2+xy-2y2-x+7y-6 2x2+xy-3y2+x+4y-1因式分解 已知2x=3y,求xy／(x2+y2)-y2／(x2-y2)的值 已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以（x2+y2/x