函数f:{1,2,3}→{1,2,3}满足f(f(x))=f(x),则这样的函数个数共有多少?我看了很多这道题的讲解,但还是没懂.f[f(x)]=f(x),则就是:f(x)=x,这块我懂但函数f:{1,2,3}→{1,2,3}哪块相当于f(x)?哪块相当于x呀?还有
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![函数f:{1,2,3}→{1,2,3}满足f(f(x))=f(x),则这样的函数个数共有多少?我看了很多这道题的讲解,但还是没懂.f[f(x)]=f(x),则就是:f(x)=x,这块我懂但函数f:{1,2,3}→{1,2,3}哪块相当于f(x)?哪块相当于x呀?还有](/uploads/image/z/11173294-46-4.jpg?t=%E5%87%BD%E6%95%B0f%3A%7B1%2C2%2C3%7D%E2%86%92%7B1%2C2%2C3%7D%E6%BB%A1%E8%B6%B3f%28f%28x%29%29%3Df%28x%29%2C%E5%88%99%E8%BF%99%E6%A0%B7%E7%9A%84%E5%87%BD%E6%95%B0%E4%B8%AA%E6%95%B0%E5%85%B1%E6%9C%89%E5%A4%9A%E5%B0%91%3F%E6%88%91%E7%9C%8B%E4%BA%86%E5%BE%88%E5%A4%9A%E8%BF%99%E9%81%93%E9%A2%98%E7%9A%84%E8%AE%B2%E8%A7%A3%2C%E4%BD%86%E8%BF%98%E6%98%AF%E6%B2%A1%E6%87%82.f%5Bf%28x%29%5D%3Df%28x%29%2C%E5%88%99%E5%B0%B1%E6%98%AF%EF%BC%9Af%28x%29%3Dx%2C%E8%BF%99%E5%9D%97%E6%88%91%E6%87%82%E4%BD%86%E5%87%BD%E6%95%B0f%3A%7B1%2C2%2C3%7D%E2%86%92%7B1%2C2%2C3%7D%E5%93%AA%E5%9D%97%E7%9B%B8%E5%BD%93%E4%BA%8Ef%28x%29%3F%E5%93%AA%E5%9D%97%E7%9B%B8%E5%BD%93%E4%BA%8Ex%E5%91%80%3F%E8%BF%98%E6%9C%89)
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