math - suites

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formule de récurrence SA

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Description and Tags

SA & SG + aires et périmètres

9 Terms

1

formule de récurrence SA

un = u₁ + (n - 1) . q

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2

formule de la somme SA

Sn = n . (u₁ + un) / 2

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3

formule de récurrence SG

un = u₁ . q* n-1

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4

formule de la somme SG

Sn = u₁ . (1 - q* n) / (1 - q)

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5

périmètre cercle

2 . π . r

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6

aire du cercle

π . r²

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7

aire du triangle

b . h / 2 ou L . l / 2

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8

aire du rectangle

L . l

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9

aire du carré

c . c = c²

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