(8xy- x2+y2)-(x2-y2+8xy) 2是平方

(x2+xy+y2)-4xy(x2+y2) x2-2xy-8y2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 (x2+xy+y2)-4xy(x2+y2)因式分解 因式分解x2+xy-3y2 (x-y)(x2+xy+y2) (x+y)(x2-xy+y2) X2+3xy+y2因式分解 x2-2xy+y2-9 (8xy- x2+y2)-(x2-y2+8xy) 2是平方 (x2+y2)(x2-xy+y2)-2x2y2因式分解 分式分解：4y2-x2/-x2-4y2+4xy x2+xy+y2=19求x2+y2最小值 x2-y2=xy,xy不等于0求x2/y2=y2/x2 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=?