(√2 + 1) · (√2 -1) = √2² - 1² = 2 -1 = 1
(√3 + √2) ·(√3 - √2) = √3² - √2² = 3 -2 = 1
....................................
(√100 + √99 ) · ( √100 - √99 ) = √100² - √99² = 100 - 99 = 1
rationalizam
ex . = √2 - 1 + √3 - √2 .... + √99 - √98 + √100 - √99
= - 1 + √100 = -1 + 10 = 9