지수

정의

숫자로 표현

$$2\times2=2^2 $$

$$2\times2\times2=2^3 $$

$$3\times3=3^2 $$

$$3\times3\times3=3^3 $$

$$1\div2=2^{-1} $$

$$1\div2\div2=2^{-2} $$

$$1\div3=3^{-1} $$

$$1\div3\div3=3^{-2} $$

문자로 표현

$$1\div{a}=a^{-1} $$

$$1\div{a}\div{a}=a^{-2} $$