bonjour
1/20 +1/4+1/6+ 1/3
=3/60+15/60+10/60+20/60
=48/60
il reste donc pour le dernier exercie
1 -48/60 = 60/60-48/60 = 12/60 = 1/5
1/5x60 = 60/5 = 12 mn
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bonjour
1/20 +1/4+1/6+ 1/3
=3/60+15/60+10/60+20/60
=48/60
il reste donc pour le dernier exercie
1 -48/60 = 60/60-48/60 = 12/60 = 1/5
1/5x60 = 60/5 = 12 mn