Question

Tính:  

\(\frac{\left(\frac{-5}{7}\right)^{n+1}}{\left(\frac{-5}{7}\right)^n}\)

Answer 1

\(\frac{\left(\frac{-5}{7}\right)^{n+1}}{\left(\frac{-5}{7}\right)^n}\)

\(=\frac{-5}{7}\)

Answer 2

#)Giải :

\(\frac{\left(\frac{-5}{7}\right)^{n+1}}{\left(\frac{-5}{7}\right)^n}=\frac{\left(\frac{-5}{7}\right)^n\times\left(\frac{-5}{7}\right)}{\left(\frac{-5}{7}\right)^n}=\frac{-5}{7}\)

Answer 3

\(\frac{\left(\frac{-5}{7}\right)^{n+1}}{\left(\frac{-5}{7}\right)^n}=\left(\frac{-5}{7}\right)^{n+1-n}=\left(\frac{-5}{7}\right)^1=\frac{-5}{7}\)

Answer 4

<=>(-5/7)^n/(-5/7)^n+1/(-5/7)^n

<=>1+1/(-5/7)^n

Answer 5

\(\frac{\left(\frac{-5}{7}\right)^{n-1}}{\left(\frac{-5}{7}\right)^n}\)

\(=\frac{\left(\frac{-5}{7}\right)^n\times\left(\frac{-5}{7}\right)^1_{ }}{\left(\frac{-5}{7}\right)^n}\)

\(=\frac{-5}{7}\)