已知f(x)=(2x²+a)/X且f(1)=3 (1)试求a的值,(2)用定义证明函数f(X)在【二分之根号2,正)上单调递增,(3)设关于X的方程f(x)=x+b的两根为x1,x2,试问是否存在实数t,使得 不等式2m&
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![已知f(x)=(2x²+a)/X且f(1)=3 (1)试求a的值,(2)用定义证明函数f(X)在【二分之根号2,正)上单调递增,(3)设关于X的方程f(x)=x+b的两根为x1,x2,试问是否存在实数t,使得 不等式2m&](/uploads/image/z/10220501-29-1.jpg?t=%E5%B7%B2%E7%9F%A5f%EF%BC%88x%EF%BC%89%3D%EF%BC%882x%26sup2%3B%2Ba%EF%BC%89%2FX%E4%B8%94f%EF%BC%881%EF%BC%89%3D3+%EF%BC%881%EF%BC%89%E8%AF%95%E6%B1%82a%E7%9A%84%E5%80%BC%2C%EF%BC%882%EF%BC%89%E7%94%A8%E5%AE%9A%E4%B9%89%E8%AF%81%E6%98%8E%E5%87%BD%E6%95%B0f%EF%BC%88X%EF%BC%89%E5%9C%A8%E3%80%90%E4%BA%8C%E5%88%86%E4%B9%8B%E6%A0%B9%E5%8F%B72%2C%E6%AD%A3%EF%BC%89%E4%B8%8A%E5%8D%95%E8%B0%83%E9%80%92%E5%A2%9E%2C%EF%BC%883%EF%BC%89%E8%AE%BE%E5%85%B3%E4%BA%8EX%E7%9A%84%E6%96%B9%E7%A8%8Bf%EF%BC%88x%EF%BC%89%3Dx%2Bb%E7%9A%84%E4%B8%A4%E6%A0%B9%E4%B8%BAx1%2Cx2%2C%E8%AF%95%E9%97%AE%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E5%AE%9E%E6%95%B0t%2C%E4%BD%BF%E5%BE%97+%E4%B8%8D%E7%AD%89%E5%BC%8F2m%26)
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