`a,(-5)^2.(-5)^3=(-5)^5`
`b,` $\text{Đúng}$
`c,(0,2)^10:(0,2)^5=(0,2)^5`
`d,[(-\frac{1}{7})^2]^4=(-\frac{1}{7})^8`
`e,` $\text{Đúng}$
`f, 8^{10}/4^{8}`
`= {8^{8} . 8^{2}}/4^{8}`
`= 8^{8}/4^{8} . 8^{2}`
`= (8/4)^{8} . 64`
`= 2^{8} . 64`
`= 256 . 64`
`= 16384`