Respostas

2013-04-14T21:57:05-03:00

PA (-5,2..) 

a5= -5 + 4*7= 23

 

PA (2,4, ...)

 a6= 2 + 5*2= 12

 

PA(x/2,x,...)

a4= x/2 + 3* x/2= 2x

 

PG(400,200,...)

 

a7= 400* (1/2)^6 = 400/64= 25/4

 

PG(1,5,..)

a8= 1*(5)^7= 78 125