Răspunsuri

2014-05-11T10:05:52+03:00
an=2n³-3n²+3n-1

a6=2*6^3-3*6^2+3*6-1
a6=2*216-3*36+18-1
a6=432-108+17
a6=341

a7=
2*7^3-3*7^2+3*7-1
a7=559