" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
n⁴+2n³+n²-2n²-2n+1 = (n²+n)² - 2(n²+n) + 1 = (n²+n-1)²
co nalezalo uzasadnic.