Pouvez vous si l exercice no1 (1) est bon merçi
1/3+1/6+1/9+1/18=
je mets tout sur 18 et le resultat je divise
1*6 1*3 1*2 1
------ +------- +------ +------- =
3*6 6*3 9*2 18

6 + 3 + 2 + 1 12/6
--- +-----+----+-------- =_____________ = 2 / 3
18 18 18 18 18/6
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