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scrieti. primii cinci termeni ai progresiei geometrice (b n ) EN. daca: a)b1=1,p =2. b)b1=2,p=-1 c)b1=-3,p =1 supra 2. d)b1=-1 supra 2 ,p=3​

Răspuns :

Răspuns:

Explicație pas cu pas:

a)b1=1,p =2

b2=p×b1=2×1=2

b3=2×2=4

b4=2×4=8

b5=2×8=16

1,2,4,8,16

b)b1=2  p=-1

b2=b1×p=2×(-1)=-2

b3=(-2)×(-1)=2

b4=-2

b5=2

2,-2,2,-2,2

c) b1=-3 p=1/2

b2=(-3)·1/2=-3/2

b3=(-3/2)×1/2=-3/4

b4=(-3/4)×1/2=-3/8

b5=-3/16

-3,-3/2,-3/4,-3/8,-3/16

d) b1=-1/2     p=3

b2=-1/2×3=-3/2

b3=-3/2×3=-9/2

b4=-9/2×3=-27/2

b5=-81/2

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