55:68,75=0,8(1 процент)
0,8*100=80
Ответ: 80
B10 = b1*q^9
b8 = b1*q^7
b10/b8 = b1*q^9/<span>b1*q^7 = q^2 = 9 => q = 3
b3 = b1*q^2
b6 = b1*q^5
b3 + b6 = </span>b1*q^2 + <span>b1*q^5 = b1(q^2 + q^5) = 168 => b1 = 168 / (q^2 +q^5) =
=168 / (3^2 + 3^5) = 168 / (9 + 243) = 168 / 252 = 2/3</span>
1) (x+y)^2+2x(3x-y)=x^2+2xy+y^2+6x^2-2xy =7x^2+y^2=7×1+2= 9