Bonjour
10^n/10^p = 10^(n-p)
10^7/10^6 = 10^(7-6) = 10^1 = 10
10^3/10^9 = 10^(3-9) = 10^(-6)
10^(-5)/10^4 = 10^(-5-4) = 10^(-9)
10^5/10^(-4) = 10^(5-(-4)) = 10^(5+4) = 10^9
