Question

Dada a P.A., determine a razão:
a) ( -3, 2, 7, ...) b) ( 23, 17, 11,...) c) ( -2, -4, -6, ...)
d) ( 1/3, 2/3, 1,...) e) (3a + b, a + b, ...)

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Answer 1

Resposta:

Explicação passo-a-passo:

a) ( -3, 2, 7, ...)

r = 2 - (-3) = 2 + 3 = 5

r = 5

b) ( 23, 17, 11,...)

r = 17 - 23 = - 6

r = -6

c) ( -2, -4, -6, ...)

r = - 4 - (-2) = - 4 + 2 = - 2

r = -2

d) ( 1/3, 2/3, 1,...)

r = 2/3 - 1/3 = 1/3

r = 1/3

e) (3a + b, a + b, ...)

r = (a+b) - (3a+b) = a + b - 3a - b = -2a

r = -2a