满足{a}包含于M真包含于{a,b,c,d}的集合M有哪几个?是不是等于3^3-1=26有点忘了已知二次函数f(x)满足f(x+1)+f(x-1)=2乘以x的平方+3x+5,求f(x)
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![满足{a}包含于M真包含于{a,b,c,d}的集合M有哪几个?是不是等于3^3-1=26有点忘了已知二次函数f(x)满足f(x+1)+f(x-1)=2乘以x的平方+3x+5,求f(x)](/uploads/image/z/10136502-54-2.jpg?t=%E6%BB%A1%E8%B6%B3%7Ba%EF%BD%9D%E5%8C%85%E5%90%AB%E4%BA%8EM%E7%9C%9F%E5%8C%85%E5%90%AB%E4%BA%8E%7Ba%2Cb%2Cc%2Cd%EF%BD%9D%E7%9A%84%E9%9B%86%E5%90%88M%E6%9C%89%E5%93%AA%E5%87%A0%E4%B8%AA%3F%E6%98%AF%E4%B8%8D%E6%98%AF%E7%AD%89%E4%BA%8E3%5E3-1%3D26%E6%9C%89%E7%82%B9%E5%BF%98%E4%BA%86%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%E6%BB%A1%E8%B6%B3f%EF%BC%88x%EF%BC%8B1%EF%BC%89%EF%BC%8Bf%EF%BC%88x%EF%BC%8D1%EF%BC%89%EF%BC%9D2%E4%B9%98%E4%BB%A5x%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%8B3x%EF%BC%8B5%EF%BC%8C%E6%B1%82f%EF%BC%88x%EF%BC%89)
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