计算 x方/x-y+y方/x-y-2x方y-2xy方/x方-2xy+y方 答案为x+y

计算:（xy分之x+y）方-x方y方分之x方-y方 计算 x方/x-y+y方/x-y-2x方y-2xy方/x方-2xy+y方 答案为x+y 计算2x-2y分之x+y-x方-y方分之x方+y方 计算 x-2分之x方+1-2-x分之3-4x （x+y）x方-y方分之x方+y-x分之y方 因式分解:(x方+y方)-4x方y方? x方y方-x方-y方+1因式分解 计算4x方-4xy+y方-4x+2y-15 4x方y方-5x方y方-9y方计算4x方-4xy+y方-4x+2y-15 4x方y方-5x方y方-9y方 x方(x-y)+(y方-x方)因式分解 换元法分解因式（x方+y方）（x方-xy+y方）-2x方y方 化简（2x方-2x方）-3（x方y方+x方）+3（x方y方+y方） 3x方+2y方=2x,求x方+y方范围 因式分解 x方+y方-xy+2x-y+1 x方-2x+y方-6y+10 因式分解 x方-4y方+2x-4y x4方-11x方y方+y4方 因式分解. 4(x方+y)(x方-y)-(2x方-y)方,其中x=2,y=-3 化简-(x方-2xy-y方)+(5x方-2xy-3y方) ((3/2x方+xy-3/5y方)*(-4/3x方y方)