Question

сократите дробь (12^n-3^n)/(2^n+1), по подробней

Answer 1

=((4*3)^n-3^n) /(2^n+1)=(4^n *3^n-3^n)-3^n)/(2^n-1)=3^n(4^n--1)/(2^n+1)=(3^n(2^n-1)(2^n+1))/(2^n+1)=3^n(2^n-1)