2,45² + 4,9 * 3,55 + 3,55² 2,45² + 2* 2,45 * 3,55 + 3,55²
------------------------------------- = ---------------------------------------------- =
4,23² - 4,23 * 2,46 + 1,23² 4,23² - 4,23 * 2 * 1,23 + 1,23²
(2,45 + 3,55)² 6²
= --------------------------- = --------- = 36 / 9 = 4
(4,23 - 1,23)² 3²