(2x+3y)－(2x＋y)(2x－y),其中x=1/3,y=－1/2

把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²＋2(x-y)－(x-y)－2(x-y)² 化简（（X－2Y）的平方＋（X－Y）（x+Y）-2（X-3Y）（X-Y））除以Y x(x-y)2-(y-x)3 把6x（x－y）的平方＋3（y－x）的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)] (x－y)(2x＋3y)－3(x＋2y)(x－2y)分解因式 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 y(x＋y)＋(x－y)²－x²－2y² [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 化简y(x+y)+(x+y)(x-y)-x^2 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 3x(2x＋y)－2x(x-y),其中x＝1,y=1/5 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 已知x和y满足x＋3y＋|3x－y|＝19,2x＋y＝6,求x,y的值