# Lũy thừa

Với a,b >0

• $$a^\alpha.a^\beta.a^\gamma = a^{\alpha +\beta+\gamma}$$
• $$(a^\alpha)^\beta = a^{\alpha\beta}$$
• $$a^\alpha.b^\alpha = (a.b)^\alpha$$
• $$a^{-\alpha} = \dfrac{1}{a^\alpha}$$
• $$\sqrt[n]{a^k} = a^\frac{k}{n}$$
• $$\sqrt[m]{\sqrt[n]{a^k}} = \sqrt[m.n]{a^k}=a^\frac{k}{m.n}$$