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Soma de Termos:<br />
S<br />
n<br />
=<br />
( a + a<br />
2<br />
1 n).<br />
n<br />
Três termos em P.A.: x − r, x , x + r<br />
ESPECIALIZAÇÃO EM INSTRUMENTAÇÃO<br />
PARA O ENSINO DE MATEMÁTICA<br />
Prof. M.Sc. Armando Paulo da Silva<br />
22
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