Răspuns :
100² - 100 - 99
100(100-1) - 99
100 • 99 - 99
9900 - 99
9801 => √9801 = 99
100 • 102 + 1
10200 + 1
10201 => √10201 = 101
100(100-1) - 99
100 • 99 - 99
9900 - 99
9801 => √9801 = 99
100 • 102 + 1
10200 + 1
10201 => √10201 = 101
100² - 100 - 99 = 100*(100-1) - 99 = 100*99 - 99 = 99(100-1) = 99² = p.p.
100*102+1 = 10200+1=10201=101*101=101² = p.p.
100*102+1 = 10200+1=10201=101*101=101² = p.p.