离散数学 什么是满射 什么是单射 举个例子f:z-z f(x)=3x; f; z-n; f(x)=|x|+1;f r-r; f(x)=x^3+1;f;n*n-n; f(x1,x2)=x1+x2+1;f;n-n*n, f(x)=(x,x+1),哪些是满射哪些是单射?为什么?这题答案是1 5为单射不是满射
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![离散数学 什么是满射 什么是单射 举个例子f:z-z f(x)=3x; f; z-n; f(x)=|x|+1;f r-r; f(x)=x^3+1;f;n*n-n; f(x1,x2)=x1+x2+1;f;n-n*n, f(x)=(x,x+1),哪些是满射哪些是单射?为什么?这题答案是1 5为单射不是满射](/uploads/image/z/7444439-71-9.jpg?t=%E7%A6%BB%E6%95%A3%E6%95%B0%E5%AD%A6+%E4%BB%80%E4%B9%88%E6%98%AF%E6%BB%A1%E5%B0%84+%E4%BB%80%E4%B9%88%E6%98%AF%E5%8D%95%E5%B0%84+%E4%B8%BE%E4%B8%AA%E4%BE%8B%E5%AD%90f%3Az-z+++f%28x%29%3D3x%3B+f%3B+z-n%3B++f%28x%29%3D%7Cx%7C%2B1%3Bf++r-r%3B+++f%28x%29%3Dx%5E3%2B1%3Bf%3Bn%2An-n%3B+++f%28x1%2Cx2%29%3Dx1%2Bx2%2B1%EF%BC%9Bf%3Bn-n%2An%2C+f%28x%29%3D%28x%2Cx%2B1%29%2C%E5%93%AA%E4%BA%9B%E6%98%AF%E6%BB%A1%E5%B0%84%E5%93%AA%E4%BA%9B%E6%98%AF%E5%8D%95%E5%B0%84%3F%E4%B8%BA%E4%BB%80%E4%B9%88%3F%E8%BF%99%E9%A2%98%E7%AD%94%E6%A1%88%E6%98%AF1++5%E4%B8%BA%E5%8D%95%E5%B0%84%E4%B8%8D%E6%98%AF%E6%BB%A1%E5%B0%84)
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