Ответы на вопрос:
1) 3х² + 13х - 10 = 0 d = 13² -4*3*(-10) = 169 + 120 = 289 = 17² ; d> 0 х₁ = ( - 13 - 17)/(2*3) = -30/6 = -5 х₂ = (- 13 + 17)/(2*3) = 4/6 = 2/3 2) 8х² - х = 0 х*(8х - 1) = 0 х₁ = 0 8х - 1 = 0 8х = 1 х = 1/8 х₂ = 0,125 3) 16х² = 49 (4х)² - 7² = 0 (4х - 7)(4х + 7) =0 4х - 7 = 0 4х =7 х = 7/4 х₁ = 1,75 4х + 7 = 0 4х = - 7 х₂ = - 1,75 3) х² - 2х - 35 = 0 d = (-2)² - 4*1*(-35) = 4 + 140 = 144 = 12² ; d> 0 х₁ = ( - (-2) - 12)/(2*1) = (2 - 12)/2 = -10/2 = - 5 х₂ = ( - (-2) + 12)/(2*1) = (2 + 12)/2 = 14/2 = 7
Популярно: Алгебра
-
morkovcha07.06.2022 17:04
-
Shivan200230.10.2022 04:07
-
543288117.09.2021 20:30
-
mrzaizat08.03.2022 11:41
-
ева51927.03.2021 14:43
-
Лизка25051504.04.2023 05:27
-
nastaklimenkofll03.08.2020 11:45
-
MINIONCHIK1707.04.2020 14:40
-
paliy200609.12.2022 23:51
-
KatherinePirs13.10.2021 02:43