Question

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1.Determine a razão de cada PA a seguir :


a) ( 2, 5 , 8 , 11, ..)

b) ( 3,6,9, 12 , .. )

c) ( 5 , 10 , 15 , ..)

d) ( 4 , 6 , 8 , .... )

e) ( 1 , 4 , 7 , 10 , ...)

f) ( 1, 5 , 9 , 13, ... )


2. Sendo a PA ( 3, 5 , 7 , 9 , ...) , determine :


a) a 20 ? b ) a30 ? c) a 44 ? d) a 45 ? e) a12?

Answer 1

a) 3

b)3

c)5

d)2

e)3

f)4

2.a) an=a1+(n-1)d

an=3+(20-1). 2

an= 3+19.2

an=22.2

an=44

b) an= 3+(30-1).2

an= 3+29.2

an= 32.2

an= 64

c) an=3+(44-1).2

an=3+43.2

an=46.2

an= 92

d)a45= 3+(45-1).2

an= 3+44.2

an= 47.2

an=94

e)a12=3+(12-1).2

an=3+11.2

an=14.2

an=24

Bons estudos!