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59347
@59347
July 2022
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5 x в квадрате -2 x + 2 =0
2× в квадрате -9x +10 =0
5x в квадрате -6x + 1 =0.
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svetazuna
5х² - 2х + 2 = 0,
Д = (-2)² - 4 * 5 * 2 = 4 - 40 = -36 < 0 - корней нет,
2х² - 9х + 10 = 0,
Д = (-9)² - 4 * 2 * 10 = 81 - 80 = 1,
х1 = (9 + 1) / 2*2 = 10/4 = 2,5 (или 2 1/2),
х2 = (9 - 1) / 2*2 = 8/4 = 2,
5х² - 6х + 1 = 0,
Д = (-6)² - 4 * 5 * 1 = 36 - 20 = 16,
х1 = (6 + 4) / 2*5 = 10/10 = 1,
х1 = (6 - 4) / 2*5 = 2/10 = 0,2 (или 1/5),
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Answers & Comments
Д = (-2)² - 4 * 5 * 2 = 4 - 40 = -36 < 0 - корней нет,
2х² - 9х + 10 = 0,
Д = (-9)² - 4 * 2 * 10 = 81 - 80 = 1,
х1 = (9 + 1) / 2*2 = 10/4 = 2,5 (или 2 1/2),
х2 = (9 - 1) / 2*2 = 8/4 = 2,
5х² - 6х + 1 = 0,
Д = (-6)² - 4 * 5 * 1 = 36 - 20 = 16,
х1 = (6 + 4) / 2*5 = 10/10 = 1,
х1 = (6 - 4) / 2*5 = 2/10 = 0,2 (или 1/5),