Tìm $3$ số $a, b, c \neq 0$, biết :

$\frac{1}{a}+\frac{1}{a+b}+\frac{1}{a+b+c}=1$
Bài này có vô số các bộ số thỏa mãn nhé, Vd: $a=1,b \neq 0, c=-2a-2b$ –  Dark 03-05-16 12:32 AM
hay nha.... –  [_đéo_có_tên_] 02-05-16 04:59 PM

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