Question

сократите пжпжпжпжжпжп

Answer 1

$\frac{3^n+3^{-n}}{9^n+1}= \frac{3^n+ \frac{1}{3^n} }{9^n+1} = \frac{3^{2n}+1}{3^n}:9^n+1= \frac{3^{2n}+1}{3^n(9^n+1)} = \frac{9^{n}+1}{3^n(9^n+1)}= \frac{1}{3^n}$

Answer 2

$MHEHUE:\frac{3^{n}*3^{n}+3^{-n}*3^{n}}{3^{n}(9^{n}+1)}=\frac{9^{n}+1}{3^{n}(9^{n}+1)}$
$OTBET:\frac{1}{3^{n}}=3^{-n}$