Question

Решите 1 ое срочно !! Алгебра

Answer 1

а)  g=6/3=2  b1=3  S6=b1(g^5-1)/g-1=3(2^5-1)/(2-1)=3*31/1=93
 b)  g=-2.5/5=-0.5   b1=5      S6=5*(-0.5^5-1)/-0.5-1= 5*(-1/32-1)/-3/2= -165/32*(-2/3)=
  =33/16=2цел 1/16

Answer 2

$1); ; 3,6,12,24,...\\q=6:3=2; ,; S_{6}= frac{b_1(1-q^6)}{1-q} = frac{3(1-2^6)}{1-2} =frac{3cdot (-63)}{-1}=189\\2); ; 5;; -2,5; ;...\\q=frac{-2,5}{5}=-0,5; ,\\S_6= frac{5(1-(-0,5)^6)}{1-(-0,5)} = frac{5cdot (1-(-0,5)^6)}{1,5} =frac{210}{64}=3frac{9}{32}$