Binome Flashcards

1
Q

somme de k de 0 à n

A

n (n + 1)

2

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2
Q

somme de k^2 de 0 à n

A

n (n + 1) (2n + 1)

6

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3
Q

somme de k^3 de 0 à n

A

(n (n + 1))^2

(2)

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4
Q

séparation somme termes pairs impairs

A

(somme pour k allant de 0 à part.ent(n/2) des a2k) +

somme pour k allant de 0 à part.ent(n-1/2) des a2k+1

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5
Q

b^n −a^n

A

n−1
(b−a)∑a^kb^n−1−k
k=0

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6
Q

b^3-a^3

A

(b−a)(b2 +ab+a2)

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7
Q

b^3+a^3

A

(b−a)(b2 -ab+a2)

bn + an = bn − (−a)n pour les impairs

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8
Q

somme pour k allant de 0 à n des x^k =1+x+x2 +···+xn =

A

1 − x^n+1 : nombre de termes

1−x

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