giup em cau tim cuc tri nay voi a.thanks.

V

vy000

[TEX]\frac{a+b}{ab(1-a-b)} \geq \frac{4(a+b)}{(a+b)^2(1-a-b)}=\frac{4}{((a+b)(1-a-b)}\geq 16[/TEX]
dấu đẳng thức [TEX]\Leftrightarrow a=b=\frac{1}{4}[/TEX]
 
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