Question

(3n-1)(n+1)+(2n-1)(n-1)-(3n+5)(n-2)

Answer 1

Ответ 2n в квадрате + 10

Answer 2

3n^2+3n-n-1+2n^2-2n-n+1-3n^2+106n-5n+10=2n^2+10