M
maloimi456


Phân tích:
a) [TEX](x-y)^3 + (y-z)^3 + (z-x)^3[/TEX]
b) [TEX]8(x+y+z)^3 - (x+y)^3 - (y+z)^3 - (z+y)^3[/TEX]
a) [TEX](x-y)^3 + (y-z)^3 + (z-x)^3[/TEX]
b) [TEX]8(x+y+z)^3 - (x+y)^3 - (y+z)^3 - (z+y)^3[/TEX]