Question

determine o numero de termos de acordo com as progressões:

a) (10,18,26,34...90)
b) (5,15,25...105)
c) (2,4,6,8,10...96)
d) (7,14,21,28...105)
e) (6,18,30...72)
f) (11,33,55,77...143)

URGETE .​

Answer 1

• assunto: numero de termos de uma PA.

• formula:

 n = (an - a1)/r + 1

a) (10,18,26,34...90) , r = 8, n = 80/10 + 1 = 9

b) (5,15,25...105) , r = 10, n = 100/10 + 1 = 11

c) (2,4,6,8,10...96) , r = 2, n = 94/2 + 1 = 48

d) (7,14,21,28...105) , r = 7, n = 98/7 + 1 = 15

e) (6,18,30...78) , r = 12, n = 72/12 + 1 = 7 (coloquei 78 para ter uma PA)

f) (11,33,55,77...143), r = 22, n = 132/22 + 1 = 7