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Clara89200
@Clara89200
June 2021
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Exercices n°31 et 32 que je dois faire mais que je ne comprends pas.
Il faut que vous m'aidiez car j'ai besoin des réponses absolument ce soir.
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pikaderic
31.
A = 2/3 (3a+5)
= 2/3 x 3a + 2/3 x 5
= 6a/3 + 10/3
= 2a + 10/3
B = 3/5 (10-20b)
= 3/5 x 10 - 3/5 x 20b
= 30/5 - 60b/5
= 6 - 12b
C = 7b(12-2b)
= 7b x 12 - 7b x 2b
= 84b - 14b^2
D = 4x(2x+5)
= 4x x 2x + 4x x 5
= 8x^2 + 20x
32.
A = 25a(4a+3+2b)
= 25a x 4a + 3 x 25a + 2b x 25a
= 100a^2 + 75a + 50ab
B = 7(a-2+3b)
= 7 x a - 7 x 2 + 7 x 3b
= 7a - 14 + 21b
Voila en espèrent t'avoir aidée :D
1 votes
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Clara89200
merci beaucoup
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A = 2/3 (3a+5)
= 2/3 x 3a + 2/3 x 5
= 6a/3 + 10/3
= 2a + 10/3
B = 3/5 (10-20b)
= 3/5 x 10 - 3/5 x 20b
= 30/5 - 60b/5
= 6 - 12b
C = 7b(12-2b)
= 7b x 12 - 7b x 2b
= 84b - 14b^2
D = 4x(2x+5)
= 4x x 2x + 4x x 5
= 8x^2 + 20x
32.
A = 25a(4a+3+2b)
= 25a x 4a + 3 x 25a + 2b x 25a
= 100a^2 + 75a + 50ab
B = 7(a-2+3b)
= 7 x a - 7 x 2 + 7 x 3b
= 7a - 14 + 21b
Voila en espèrent t'avoir aidée :D