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Denisebpninabp
@Denisebpninabp
April 2020
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Obtenh ao vigesimo primeiro termo da pa (17,21,25....)
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Lucas7XD
Verified answer
A+b=17
2a+b=21
2a+b=21
a+b=17(.-1)
2a+b=21
-a-b=-17
----------------------
a=4 #
===========================
a+b=17
4+b=17
b=17-4
b=13 #
=============================
An+B=
4.20+13=
80+13=93 #
3 votes
Thanks 1
SeptemberTen
Verified answer
Se caso quiser usar uma fórmula pra acompanhar:
an = a1 + ( n - 1 ) . r
a20 = 17 + ( 20 - 1 ) . 4
a20 = 17 + 19 . 4
a20 = 17 + 76
a20 = 93
2 votes
Thanks 3
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Lista de comentários
Verified answer
A+b=172a+b=21
2a+b=21
a+b=17(.-1)
2a+b=21
-a-b=-17
----------------------
a=4 #
===========================
a+b=17
4+b=17
b=17-4
b=13 #
=============================
An+B=
4.20+13=
80+13=93 #
Verified answer
Se caso quiser usar uma fórmula pra acompanhar:an = a1 + ( n - 1 ) . r
a20 = 17 + ( 20 - 1 ) . 4
a20 = 17 + 19 . 4
a20 = 17 + 76
a20 = 93