T
truyen223


................n......... ................... m
lim ( ---------------- - ..... -------------
x->1 1- [TEX]x^n[/TEX]....................1- [TEX]x^m[/TEX]
lim ( ---------------- - ..... -------------
x->1 1- [TEX]x^n[/TEX]....................1- [TEX]x^m[/TEX]