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Lounias
@Lounias
May 2019
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Ecrire les nombres sous la forme α/30, ou α est un nombre entier.
1. 7/10
2. 8/5
3. 5/6
4. 21/90
5. 18/60
Un grand MERCIII d' avance ...
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Par exemple :
30 = 10 × 3
donc : 7 /10 = (7×3) / (10 × 3) = 21 / 30
30 = 5 × 6
donc : 8 / 5 = (8 × 6) / (5 × 6) = 48 / 30
30 = 6 × 5
donc : 5 / 6 = (5 × 5) / (6 × 5) = 25 / 30
30 = 90 ÷ 3
donc : 21 / 90 = (21 ÷ 3) / (90 ÷ 3) = 7 / 30
tu fais le dernier ?
1 votes
Thanks 2
loulakar
1) 7 / 10 = ? / 30
? = 7 x 30 / 10
? = 210 / 10
? = 21
Donc 7 / 10 = 21 / 30
2) 8 / 5 = ? / 30
? = 8 x 30 / 5
? = 8 x 6
? = 48
Donc : 8 / 5 = 48 / 30
3) 5 / 6 = ? / 30
? = 5 x 30 / 6
? = 5 x 5
? = 25
Donc 5 / 6 = 25 / 30
4) 21 / 90 = ? / 30
? = 21 x 30 / 90
? = 21 x 3 / 9
? = 21 / 3
? = 7
Donc 21 / 90 = 7 / 30
5) 18 / 60 = ? / 30
? = 18 x 30 / 60
? = 18 x 3 / 6
? = 18 / 2
? = 9
Donc 18 / 60 = 9 / 30
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Verified answer
Par exemple :30 = 10 × 3
donc : 7 /10 = (7×3) / (10 × 3) = 21 / 30
30 = 5 × 6
donc : 8 / 5 = (8 × 6) / (5 × 6) = 48 / 30
30 = 6 × 5
donc : 5 / 6 = (5 × 5) / (6 × 5) = 25 / 30
30 = 90 ÷ 3
donc : 21 / 90 = (21 ÷ 3) / (90 ÷ 3) = 7 / 30
tu fais le dernier ?
? = 7 x 30 / 10
? = 210 / 10
? = 21
Donc 7 / 10 = 21 / 30
2) 8 / 5 = ? / 30
? = 8 x 30 / 5
? = 8 x 6
? = 48
Donc : 8 / 5 = 48 / 30
3) 5 / 6 = ? / 30
? = 5 x 30 / 6
? = 5 x 5
? = 25
Donc 5 / 6 = 25 / 30
4) 21 / 90 = ? / 30
? = 21 x 30 / 90
? = 21 x 3 / 9
? = 21 / 3
? = 7
Donc 21 / 90 = 7 / 30
5) 18 / 60 = ? / 30
? = 18 x 30 / 60
? = 18 x 3 / 6
? = 18 / 2
? = 9
Donc 18 / 60 = 9 / 30