fikusoidmomikoto 4)5^0 - 5^(-1)+5^(-2)= 1 - 1/5 +1/(5^2) = 1-1/5+1/25 = 1- 5/25 + 1/25=1-4/25= 21/25
5)16×2^(-5)= 16×1/(2^5)= 16×1/32=1/2
6) 9×3^(-3) = 9×1/(3^3) =9×1/27= 1/3