1 1 (3√7 + 7) - (3√7 - 7) 3√7 + 7 - 3√7 + 7
--- = = =
3√7 - 7 7 + 3√7 (3√7 + 7)(3√7 - 7) (3√7)² - 7²
14 14
= = = 1
63 - 49 14
1 1 (3√7 + 7) - (3√7 - 7) 3√7 + 7 - 3√7 + 7
--- = = =
3√7 - 7 7 + 3√7 (3√7 + 7)(3√7 - 7) (3√7)² - 7²
14 14
= = = 1
63 - 49 14