(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy

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(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy

(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy
(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy

(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy
(x-y)分之x-(x+y)分之y+(x的2次方-y的2次方)分之2xy
=(x-y)分之x-(x+y)分之y+(x-y)(x+y)分之2xy
=(x-y)(x+y)分之[x(x+y)-y(x-y)+2xy]
=(x-y)(x+y)分之(x平方＋2xy＋y平方)
=(x-y)(x+y)分之(x+y)平方
=(x-y)分之(x+y)

计算:y-x分之x+y+x-y分之y-y-x分之2x-y 计算:x-y分之x+y-x分之y x-y分之x-y 是不是分式? 1- X+Y分之X-Y 分之 1+ X+Y分之X-Y 1- X+Y分之X-Y 分之 1+ X+Y分之X-Y 2x分之1- x+y分之1(2x分之x+y -x-y)化简 x+y分之1-(x+y)的平方x-y x-4y分之3x + 4y-x分之x+y - x*x-4y分之7y 化简1-x分之y分之1+x分之y x分之x(x+y)是不是分式 x减y分之x加y乘以x加y分之x减y x-y分之x+y乘以x+y分之y-x等于多少 通分x+y分之x-y,x-y分之x+y 2分之x+y+3分之x-y；4（x+y）-（x-y)谢谢了, 数学题：【x-y分之x+y乘x+y分之y-x】 根号x-根号y分之x+y-x根号y-y根号x分之2xy y-x分之2x-3y-x-y分之x+2y 2x-3y分之y-x-x+2y分之x-y