ME AJUDEMMMPROGRESSAO ARITMETICA: calcule a soma dos vinte primeiros termos da PA(-45, -41,..).... Pergunta de ideia dedanielearaujo

danielearaujo @danielearaujo

October 2020 1 105 Report

ME AJUDEMMM

PROGRESSAO ARITMETICA:

calcule a soma dos vinte primeiros termos da PA(-45, -41,..)

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Luanferrao

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$a_2_0 = a_1+19r\\\\ a_2_0 = -45+19*4\\\\ a_2_0 = -45+76\\\\ \boxed{a_2_0=31}$

$\boxed{S_n=\frac{(a_1+a_n)*n}{2}}\\\\ S_2_0 = \frac{(-45+31)*20}{2}\\\\ S_2_0 = -14*10\\\\ \boxed{S_2_0=-140}$

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danielearaujo me ajuda nessa também?? calcule a31 da PA (-31, -35,..)

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PROGRESSAO ARITMETICA numa PA, a8=16 e a10=20. calcule a1, r e a20

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