1) ((3n+2)^2 - (3n-2)^2)/24= (3n+2+3n-2)(3n+2-3n+2)/24=4*6*n/24=n2) ((5n+3)^2 -(5n-3)^2/60 = (5n+3+5n-3)(5n+3-5n+3)/60=10n*6/60=n
^2 - возведение в квадрат
1) ((3n+2)^2 - (3n-2)^2)/24= (3n+2+3n-2)(3n+2-3n+2)/24=4*6*n/24=n
2) ((5n+3)^2 -(5n-3)^2/60 = (5n+3+5n-3)(5n+3-5n+3)/60=10n*6/60=n
^2 - возведение в квадрат