Question

（5的n分之一次方 - 5的负n分之一次方）的n次方是多少

Answer 1

(5^1/n-5^-1/n)^n

=5^1/n*n+2*5^1/n*5^-1/n+5^-1/n*n

=5+5^1/n-1/n+5^-1

=5+0+1/5

=26/5