计算x2+y2+2xy分之x2-4y2/x2+xy分之2y+xx后的2表示平方

计算：(xy-x2)÷xy分之x2-2xy+y2 计算x2+y2+2xy分之x2-4y2/x2+xy分之2y+xx后的2表示平方 (x2+xy+y2)-4xy(x2+y2) 计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2） 4x2-3y2+2xy-4x2+5x2 已知6x2减去xy减去15y2等于0,求分式2x2减去3xy减去3y2分之x2减去2xy+4y2 分解因式：四分之x2+xy+y2 2、四分之x2+xy+y2 3、a2b2-4ab+4 4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy x2+y2+2xy=256 x2+y2-2xy=4 (x2, (x2+xy+y2)-4xy(x2+y2)因式分解 (x2+2xy+y2)( x2-xy+y2)2 化简 (x2-2xy+y2)-(x2+2xy+y2)=什么 ( x2+xy+y2) ( x2+xy+2y2)-12y4 化成最简分式:6x2-7xy-3y2分之2x2+xy-6y2 x2-2xy+y2-4分解因式 4x2+3xy-2y2因式分解 x2-2xy+y2-9 已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值