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MarianaKimbely
@MarianaKimbely
October 2020
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determine o 20º termo da p.a( 2,7...) e o 7º termo da p,a (1,-1)
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helviotedesco
Verified answer
r = 7 - 2
Razão = r =
5
an =
a1 + ( n -1 ) . r
a20 =
2 + ( 20 -1 ) . 5
a20 =
2 + 19 . 5
a20 =
2 + 95
a20 =
97
======================
r = -1 - ( + 1 )
Razão = r =
-2
an =
a1 + ( n -1 ) . r
a7 =
1 + ( 7 -1 ) . ( -2 )
a7 =
1 + ( 6 ) . -2
a7 =
1 - 12
a7 =
-11
2 votes
Thanks 3
helviotedesco
obrigado
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Verified answer
r = 7 - 2 Razão = r = 5an = a1 + ( n -1 ) . r
a20 = 2 + ( 20 -1 ) . 5
a20 = 2 + 19 . 5
a20 = 2 + 95
a20 = 97
======================
r = -1 - ( + 1 ) Razão = r = -2
an = a1 + ( n -1 ) . r
a7 = 1 + ( 7 -1 ) . ( -2 )
a7 = 1 + ( 6 ) . -2
a7 = 1 - 12
a7 = -11