Răspunsuri

2014-11-02T22:05:04+02:00
^-putere
5^(2n+3)-4·25^n+5^2n=
5^2n·5³-4·5^2n+5^2n=
5^2n(5³-4+1)=
5^2n·(125-4+1)=5^2n·120