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Lareinedesneiges
@Lareinedesneiges
June 2021
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20 POINTS URGENT SVP!!!!!!!!
Calculer: ((a+b)au carré - (a-b)au carré))
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Cxrly
Identités remarquables :
( a + b )² = a² + 2ab + b²
( a - b )² = a² - 2ab + b²
( (a+b)² - (a-b)² )
= ( a² + 2ab + b² ) - ( a² - 2ab + b² )
= a² + 2ab + b² - a² + 2ab - b²
= 4ab
1 votes
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SeliM14
Ça va te donner sans doute a×2+2×a×b+b×2 - a×2-2×a×b + b×2
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( a + b )² = a² + 2ab + b²
( a - b )² = a² - 2ab + b²
( (a+b)² - (a-b)² )
= ( a² + 2ab + b² ) - ( a² - 2ab + b² )
= a² + 2ab + b² - a² + 2ab - b²
= 4ab