4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy

(x2+xy+y2)-4xy(x2+y2) 4x2-3y2+2xy-4x2+5x2 (x2+2xy+y2)( x2-xy+y2)2 化简 (x2-2xy+y2)-(x2+2xy+y2)=什么 ( x2+xy+y2) ( x2+xy+2y2)-12y4 x2-2xy+y2-9 4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy x2+y2+2xy=256 x2+y2-2xy=4 (x2, x2-2xy+y2-4分解因式 4x2+3xy-2y2因式分解 (x2+y2)(x2-xy+y2)-2x2y2因式分解 计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2） 求证:(x2-xy+y2)3+(x2+xy+y2)3能被2x2+2y2整除 若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=? x2-2xy+y2=4 x2+y2-x-y=6 解不等式x2-2xy+y2=4 x2+y2-x-y=6 解不等式 解方程组 x2+2xy+y2-4=0 x2-2xy+y2-1=0 (2x2-3xy+4y2)+(x2+2xy-3y2）化简（要有过程） 分解因式(x2+xy+y2)2-4xy(x2+y2)=?