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Mathematics, 09.07.2021 14:00 naenae662
1) Se o 5o e o 9-o termos de uma PA são, respectivamente, 40 e 68, então a razão r da
progressão é:
a) r = 6
b) r = 7
c) r = 9
d) r = 11
e) r = 12
2) Inserindo-se 6 números entre 72 e 107, de modo que a sequência (72, a2, a3, a4, a5, a6,
a7 ,107) seja uma progressão aritmética, tem-se a3 igual a:
a) 78
b) 79
c) 80
d) 81
e) 82
3) Thiago ficou sem parceiro para jogar bolita (bola de gude); então pegou sua coleção de
bolitas e formou uma seqüência de ―T‖ (a inicial de seu nome), conforme a figura a seguir.
Supondo que o garoto conseguiu formar 10 ―T‖ completos, pode-se, seguindo o mesmo padrão,
afirmar que ele possuía:
a) mais de 300 bolitas.
b) pelo menos 230 bolitas.
c) menos de 220 bolitas.
d) exatamente 300 bolitas.
e) exatamente 41 bolitas.
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Answers: 1
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1) Se o 5o e o 9-o termos de uma PA são, respectivamente, 40 e 68, então a razão r da
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