Question

Dau multe puncte, îmi trebuie urgent. !!!!!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

b1=1     q=4

a) b3=b1×q²=1×416

b4=b3×q=16×4=64

b9=b1×q^(9-1)=4^8

b100=b1×q^99=4^99

b)S10=b1(q^10-1)/(q-1)=1×(4^10-1)/(4-1)=(4^10-1)/3

6

a)b3=16=b1×q²

b6=b1×q^5=1024       b6/b3=q^(5-2)=q³=1024/16=64   ⇒q=∛64=2

b)  b3=b1×q²=16=b1×2²         ⇒b1=16/4=4

b4=b3×q=16×2=32

c)S6=b1(2^6-1)/(2-1)=4×(64-1)/1=4×63=252

7

(3x-6)²=3×147     ⇒(3x-6)²=441      ⇒(3x-6)²=21²      3x=27     x1=9

3x-6=-21    3x=-15   x2=-5