25(X－Y)^2-16(X＋Y)^2

25(X－Y)^2-16(X＋Y)^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 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 y(x＋y)＋(x－y)²－x²－2y² (12-2x)/X=(-16-2Y)/Y X^2+Y^2=25 Y 化简y(x+y)+(x+y)(x-y)-x^2 (x+y)^2-16(x-y)^2 (x+y)^2-16(x-y)^2 16-8（x-y)+(x-y)2 (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 9（x＋y)^2－(x－y)^2 (x－y)^2－10(y－x)+25 25(2x+y)^2-16(x-2y)^2 因式分解16(x+y)^2-25(x-y)^2 25(y-x)^2-16(x+y)^2因式分解 16(x-y)^2-25(x+y)^2