Прогрессия # bn = 5 * 2 в n степени. b2 = ? q = ? b4 = ? # b1=1/4 q=2 b8=? # b2=2 q=1/2 b1=? b3=? b4=?

1. б1= 5*2^1= 10
б2=5*2^2=20
q=20/10=2
б4=5*2^4=80
2. б8=1/4*2^7=128/4=32
3. 1/2б1=2
б1=4
б3=4*(1/2)^2=4*1/4=1
б4=4*(1/2)^3=4*1/8=1/2