Question

2) Escreva cada PA sabendo que:
a) A1= -5 e r = 3

b) A1= -5/2 e r = 1/2

c) ( A1= x+1/2 ) e r = x

d) A1= 12 e r = -2

Answer 1

a) (-5,-2,1,4,7,...) b) p o 2° termo: -5/2+1/2=-4/2=-2 P o 3°: -2+1/2=-4+1/2=-3/2. PA: (-5/2,-2,-3/2,...) c) o 2° termo: x+1/2+x=x+1+2x/2=3x+1/2. O 3°termo: 3x+1/2+x= 3x+1+2x/2=5x+1/2. A PA fica: (x+1/2, 3x+1/2, 5x+1/2,...). d) (12,10,8,6,...). Att.