Bonjour, a. - 2/11 * 11/(-5) = 1) -5/2 2) 2/5 3) -2/5 b. (2/7 + 3/7) ÷ 1/5 = 1) 1/7 2) 25/7 3) 17/7 c. 5/2 - 2/3 ÷ 5/3 + 2/3 1) 3/3 ÷ 7/3 2) 5/3 - 2/5 + 2/3 3)
Mathématiques
BlackBeard
Question
Bonjour,
a. - 2/11 * 11/(-5) =
1) -5/2
2) 2/5
3) -2/5
b. (2/7 + 3/7) ÷ 1/5 =
1) 1/7
2) 25/7
3) 17/7
c. 5/2 - 2/3 ÷ 5/3 + 2/3
1) 3/3 ÷ 7/3
2) 5/3 - 2/5 + 2/3
3) 3/3 * 3/5 + 2/3
d. (2+3)/(4*7) s'écrit aussi...
1) (2 + 3) ÷ (4 * 7)
2) (2 + 3) ÷ 7(4 * 7)
3) 2 + 3 ÷ 4 * 7
a. - 2/11 * 11/(-5) =
1) -5/2
2) 2/5
3) -2/5
b. (2/7 + 3/7) ÷ 1/5 =
1) 1/7
2) 25/7
3) 17/7
c. 5/2 - 2/3 ÷ 5/3 + 2/3
1) 3/3 ÷ 7/3
2) 5/3 - 2/5 + 2/3
3) 3/3 * 3/5 + 2/3
d. (2+3)/(4*7) s'écrit aussi...
1) (2 + 3) ÷ (4 * 7)
2) (2 + 3) ÷ 7(4 * 7)
3) 2 + 3 ÷ 4 * 7
1 Réponse
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1. Réponse maudmarine
Bonjour,
a. - 2/11 * 11/(-5)
= - 22/55
= (11 x - 2) / (11 x 5)
= - 2/5
Réponse 3) -2/5
b. (2/7 + 3/7) ÷ 1/5
= 5/7 x 5
= 25/7
Réponse 2) 25/7
c. 5/2 - 2/3 ÷ 5/3 + 2/3
= 5/2 - 2/3 x 3/5 + 2/3
= 5/2 - 6/15 + 2/3
= (5 x 15) / (2 x 15) - (6 x 2) / (15 x 2) + (2 x 10) / (3 x 10)
= 75/30 - 12/30 + 20/30
= 95/30 - 12/30
= 83/30
1) 3/3 ÷ 7/3
= 3/3 x 3/7
= 9/21
= (3 x 3) / (3 x 7)
= 3/7
2) 5/3 - 2/5 + 2/3
= (5 x 5) / (3 x 5) - (2 x 3) / (5 x 3) + (2 x 5) / (3 x 5)
= 25/15 - 6/15 + 10/15
= 35/15 - 6/15
= 29/15
3) 3/3 * 3/5 + 2/3
= 9/15 + 2/3
= 9/15 + (2 x 5) / (3 x 5)
= 9/15 + 10/15
= 19/15
d. (2+3)/(4*7) s'écrit aussi...
Réponse 1) (2 + 3) ÷ (4 * 7)