1)q=12/48=1/4
b6=48*(1/4)^5-48/1024=3/64
bn=48*(1/4)^n-1=3*2^(5-2n)
2)q=-32/3:64/9=-32/3*9/64=-3/2
b6=64/9*(-3/2)^5=-54
bn=64/9*(-3/2)^n-1=16*(-3/2)^n-3
3)q=-0,01:(-0,001)=10
b6=-0,001*10^5=100
bn=-0,001*10^n-1=(-10)^n-4
4)q=10:(-100)=-1/10
b6=-100*(-1/10)^5=-0,001
bn=-100*(-1/10)^n-1=-(-10)^1+n