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Frtgy54
@Frtgy54
January 2021
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Bonjour! J'ai un problème pour développer et ensuite réduire cette expression!
a³-(a-3y)³
Merci!
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nini999
Verified answer
Bonjour :
a³ - (a - 3y)³
a³ - (a - 3y)(a - 3y)(a - 3y)
a³ - (a - 3y)²(a - 3y)
(a - 3y)³ il prend la forme de (a-b)² = a²-2ab+b²
Alors :
a³ - [a² - 2×a×3y + (3y)²](a - 3y)
a³ - (a² - 6ay + 9y²)(a - 3y)
a³ - (a²×a - a²×3y - 6ay×a + 6ay×3y + 9y²×a - 9y²×3y)
a³ - (a³ - 3a²y - 6a²y + 18ay² + 9ay² - 27y³)
a³ - (a³ - 9a²y + 27ay² - 27y³)
a³ - a³ + 9a²y - 27ay² + 27y³
0 + 9a²y - 27ay² + 27y³
9a²y - 27ay² + 27y³
J’espère t'avoir t'aider
1 votes
Thanks 1
Frtgy54
Merci beaucoup, et je pense que tu as raison!!!!
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Verified answer
Bonjour :a³ - (a - 3y)³
a³ - (a - 3y)(a - 3y)(a - 3y)
a³ - (a - 3y)²(a - 3y)
(a - 3y)³ il prend la forme de (a-b)² = a²-2ab+b²
Alors :
a³ - [a² - 2×a×3y + (3y)²](a - 3y)
a³ - (a² - 6ay + 9y²)(a - 3y)
a³ - (a²×a - a²×3y - 6ay×a + 6ay×3y + 9y²×a - 9y²×3y)
a³ - (a³ - 3a²y - 6a²y + 18ay² + 9ay² - 27y³)
a³ - (a³ - 9a²y + 27ay² - 27y³)
a³ - a³ + 9a²y - 27ay² + 27y³
0 + 9a²y - 27ay² + 27y³
9a²y - 27ay² + 27y³
J’espère t'avoir t'aider