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Leannouuu30
@Leannouuu30
May 2019
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A.Vérifier que : 1*3=2²-1 2*4=3²-1 3*5=4²-1 b.Adeline affirme: "100 005*100007=100006²-1." Comment peut-elle en être certaine ?
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MonsieurFirdown
Verified answer
Bonjour
♧1. Vérifier que :
1×3 =2²-1
3 = 3
2×4 = 3²-1
8 = 8
3×5 = 4²-1
15 = 15
♧2. On a :
100005×100007 = 100006²-1
100005×100007 = (100006-1)(100006+1)
100005×100007 = 100005×100007
Voilà ^^
1 votes
Thanks 1
cossin23
Verified answer
Bonjour,tu as la réponse
2 votes
Thanks 1
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Verified answer
Bonjour♧1. Vérifier que :
1×3 =2²-1
3 = 3
2×4 = 3²-1
8 = 8
3×5 = 4²-1
15 = 15
♧2. On a :
100005×100007 = 100006²-1
100005×100007 = (100006-1)(100006+1)
100005×100007 = 100005×100007
Voilà ^^
Verified answer
Bonjour,tu as la réponse