...个不相等的实数根 (1)求实数k的取值范围 (2)若x=0
发布网友
发布时间：2024-10-23 07:07
共1个回答
热心网友
时间：4分钟前
(1) ∆ = 4(k - 1)² - 4(k² - 1) = 4(k² - 2k + 1 - k² + 1) = 8(1 - k) > 0
k < 1
(2) x₁x₂ = k² - 1 = 0, k = ±1
k = 1: x² = 0, x₁ = x₂ = 0, 舍去
k = -1: x²-4x = x(x - 4) = 0, x = 0, x = 4
另一个根为4
