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charlesartetern
@charlesartetern
October 2020
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AJUDEM ?
Numa PA na qual o 20° tem é 157 e o 1° termo é 5, a razão é igual a:
A) 10
B) 9
C) 8
D) 7
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AntoniLAD
Verified answer
A20=157
a1=5
Razão:
157-5
=
152
=8 é a razão
20-1 19
0 votes
Thanks 1
GFerraz
A₂₀ = 157
A₁ = 5
Calculamos A₂₀ com a fórmula:
A₂₀ = A₁ + (n - 1).r
157 = 5 + 19.r
19.r = 152
r = 152/19
r = 8, Alternativa C
0 votes
Thanks 0
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Lista de comentários
Verified answer
A20=157a1=5
Razão:
157-5=152=8 é a razão
20-1 19
A₁ = 5
Calculamos A₂₀ com a fórmula:
A₂₀ = A₁ + (n - 1).r
157 = 5 + 19.r
19.r = 152
r = 152/19
r = 8, Alternativa C