1) a.Calculer : 1/4 +1/3 (1-1/4) =
1/4+1/3- 1/3*1/4=
3/12+ 4/12 -1/12 =
7/12-1/12 =
6/12 =1/2
b. Comparer A et 1/2
A = 1/2
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1) a.Calculer : 1/4 +1/3 (1-1/4) =
1/4+1/3- 1/3*1/4=
3/12+ 4/12 -1/12 =
7/12-1/12 =
6/12 =1/2
b. Comparer A et 1/2
A = 1/2