Răspuns:
Explicație pas cu pas:
a)
6, 18, 54....
18 = 6*3
54 = 18*3
b1 = 6
q = 3
bn = 6*3^n-1
_____________
b)
2, 1, 1/2.....
1 : 2 = 1/2
1/2 : 1 = 1/2
b1 = 1
q = 1/2
bn = 1*(1/2)^n-1
______________
c)
-1; 1/3; -1/9,....
1/3 : (-1) = -1/3
-1/9 : 1/3 = -1/3
b1 = -1
q = -1/3
bn = -1*(-1/3)^n-1
_________________
d)
√2, 1. √2/2, 1/2,....
1 : √2 = 1/√2
√2/2 : 1 = √2/2 = 1/√2
1/2 : √2/2 = 1/√2
b1 = √2
q = 1/√2
bn = √2*(1/√2)^n-1
__________________
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