当a为何值时,方程x²+ax+a+3=0(1)有两个不相等的正实数根?(2)有两个不相等的负实数根?(3)两根之差小于2的根号5?(4)两根均大于2?
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![当a为何值时,方程x²+ax+a+3=0(1)有两个不相等的正实数根?(2)有两个不相等的负实数根?(3)两根之差小于2的根号5?(4)两根均大于2?](/uploads/image/z/1587504-48-4.jpg?t=%E5%BD%93a%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E6%96%B9%E7%A8%8Bx%26%23178%3B%2Bax%2Ba%2B3%3D0%EF%BC%881%EF%BC%89%E6%9C%89%E4%B8%A4%E4%B8%AA%E4%B8%8D%E7%9B%B8%E7%AD%89%E7%9A%84%E6%AD%A3%E5%AE%9E%E6%95%B0%E6%A0%B9%3F%EF%BC%882%EF%BC%89%E6%9C%89%E4%B8%A4%E4%B8%AA%E4%B8%8D%E7%9B%B8%E7%AD%89%E7%9A%84%E8%B4%9F%E5%AE%9E%E6%95%B0%E6%A0%B9%3F%EF%BC%883%EF%BC%89%E4%B8%A4%E6%A0%B9%E4%B9%8B%E5%B7%AE%E5%B0%8F%E4%BA%8E2%E7%9A%84%E6%A0%B9%E5%8F%B75%3F%EF%BC%884%EF%BC%89%E4%B8%A4%E6%A0%B9%E5%9D%87%E5%A4%A7%E4%BA%8E2%3F)
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当a为何值时,方程x²+ax+a+3=0(1)有两个不相等的正实数根?(2)有两个不相等的负实数根?(3)两根之差小于2的根号5?(4)两根均大于2?
当a为何值时,方程x²+ax+a+3=0
(1)有两个不相等的正实数根?
(2)有两个不相等的负实数根?
(3)两根之差小于2的根号5?
(4)两根均大于2?
当a为何值时,方程x²+ax+a+3=0(1)有两个不相等的正实数根?(2)有两个不相等的负实数根?(3)两根之差小于2的根号5?(4)两根均大于2?
(1)△>0
当x=0时a+3>0
-a/2>0
同时满足可得-3