Решите систему уравнений y + 4/x = -2 x - 4/y = - вопрос №42437521294 от РоузХз 04.08.2020 18:04

Question

Алгебра: Решите систему уравнений y + 4/x = -2 x - 4/y = 3

РоузХз · Answer

Y + 4/x = -2 |*xx - 4/y = 3 |*yxy + 4 = -2xxy - 4 = 3yxy + 2x = -4xy - 3y = 4 |*(-1)xy + 2x = -4+-xy + 3y = -4___2x + 3y = -8x = (-8 - 3y) / 2x = (-8 - 3y) / 2(-8 - 3y) / 2 * y - 3y = 4x = (-8 - 3y) / 2(-8 - 3y)*y / 2 - 3y = 4x = (-8 - 3y) / 2(-8y - 3y^2) / 2 - 3y = 4 |*2x = (-8 - 3y) / 2-8y - 3y^2 - 6y = 8x = (-8 - 3y) / 2-3y^2 - 14y = 8-3y^2 - 14y = 8-3y^2 - 14y - 8 = 0D = (-14)^2 - 4*(-3)*(-8) = 196 - 96 = 100 = 10^2y1 = (14-10) / (-6) = -2/3y2 = (14+10) / (-6) = -4Отсюда,х1 = -8 - 3 * (-2/3)...