xy方-x方y方分之x方-1约分得?

xy方-x方y方分之x方-1约分得? 计算:（xy分之x+y）方-x方y方分之x方-y方 x方-xy+1/4y方 x方y方-x方-y方+1因式分解 x方+y方-x方y方-4xy-1因式分解 (1/2x方+xy-1.5y方)/(x方-y方) x方-xy+y方 等于? 化解的题xy+y方--------x方-y方 因式分解 x方+y方-xy+2x-y+1 化简求值,若X方-2XY+Y方+1XY-11=0,求X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y的值 计算：(1)xy分之x方-y方乘以x-y分之x 设x(x-1)-(x方-y)=-2,求二分之x方+y方,再减xy的值 (x-y)方分之一和x方-3xy+2y方分之2,通分 已知X=2+根号3分之1,XY等于1,则X方减Y方分之X方Y减XY方等于? -2（1-2分之3x)-4x(2-4分之x) 2x方（-3xy方）-x(x方y方-2x) 换元法分解因式（x方+y方）（x方-xy+y方）-2x方y方 a方分之x方加b方分之y方=1,求证a方加b方大于等于(x+y)方 化简-(x方-2xy-y方)+(5x方-2xy-3y方)