9×1099 \times 10^{9}9×109
8.85×10−128.85 \times 10^{-12}8.85×10−12
18.85×10−12\frac{1}{8.85 \times 10^{-12}}8.85×10−121
19×109\frac{1}{9 \times 10^{9}}9×1091
