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Sillygirlonly
@Sillygirlonly
January 2020
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Numa progressao aritmetica o primeiro termo é 9 e o ultimo 111. Sabendo-se que a mesmo possui 41 termos, determine termo central:
a60
b)-40
c)10
d)50
e)20
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exalunosp
A1 = = 9
a41 = 111
a1 + 40r = 111
9 + 40r = 111
4or = 111-9
40r = 102
r = 102/40 =51/20 ***
a21 = a1 + 20r
9 + 20 ( 51/20) = 9 + 51 = 60 *** ( a )
1 votes
Thanks 1
sillygirlonly
muitoo obrigadaa :D
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a41 = 111
a1 + 40r = 111
9 + 40r = 111
4or = 111-9
40r = 102
r = 102/40 =51/20 ***
a21 = a1 + 20r
9 + 20 ( 51/20) = 9 + 51 = 60 *** ( a )