Progresii aritmetice Flashcards

1
Q

Termenul general

A

an = a1+(n-1)*r

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2
Q

Ratia

A

r=an-an-1

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3
Q

a, b, c

A

b= a+c/2

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4
Q

suma

A

sn=(a1+an) *n/2

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