已知函数f(x)=lg[(a^2-1)x^2+(a+1)x+1],若f(x)的值域为R,求实数a的取值范围你的回答:见http://zhidao.baidu.com/question/31815195.html因为f(x)的值域为R,则(a^2-1)x^2+(a+1)x+1必须能够取遍所有正实数, 即(0,+无穷
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![已知函数f(x)=lg[(a^2-1)x^2+(a+1)x+1],若f(x)的值域为R,求实数a的取值范围你的回答:见http://zhidao.baidu.com/question/31815195.html因为f(x)的值域为R,则(a^2-1)x^2+(a+1)x+1必须能够取遍所有正实数, 即(0,+无穷](/uploads/image/z/6075549-45-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dlg%5B%28a%5E2-1%29x%5E2%2B%28a%2B1%29x%2B1%5D%2C%E8%8B%A5f%28x%29%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BAR%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E4%BD%A0%E7%9A%84%E5%9B%9E%E7%AD%94%EF%BC%9A%E8%A7%81http%3A%2F%2Fzhidao.baidu.com%2Fquestion%2F31815195.html%E5%9B%A0%E4%B8%BAf%28x%29%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BAR%2C%E5%88%99%28a%5E2-1%29x%5E2%2B%28a%2B1%29x%2B1%E5%BF%85%E9%A1%BB%E8%83%BD%E5%A4%9F%E5%8F%96%E9%81%8D%E6%89%80%E6%9C%89%E6%AD%A3%E5%AE%9E%E6%95%B0%2C+%E5%8D%B3%EF%BC%880%2C%EF%BC%8B%E6%97%A0%E7%A9%B7)
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