(x十2y)(x-2y)-(2x-y)(-2x十y)

(x十2y)(x-2y)-(2x-y)(-2x十y) 化简x十Y/根号x十根号y十2Xy/x根号y十y根号x x十y+2x十2y一1x十7y= x十y=10,2X十y=12,求x、y x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 （x十2y）(2x-y)怎么计算 4十12(x一y)+9(x+y)^2 2x十4y/3二1.35(x+y) 己知/x十2/十/y十4/求x十y (x十2y一z)(x一2y十z)一(x十2y十z)2 化简y(x+y)+(x+y)(x-y)-x^2 x分之a十x分之b=?x-y分之x^2十y-x分之y^=? 计算：(x/x-y)*(y^2/x+y)-(x^4y/x^4-y^4)/x^2/x^2+y^2如题,快,十分钟发 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2 18x立方y平方十12x平方y平方－2x立方y (2x十y十1)(2x十y一1)怎么算