如果A={-1,0,1}B={2,3,4,5,7}f表示A到B的映射,x+f(x)+xf(x)为奇数的映射有多少个答案是3x5x5=75.我只知道3x5是怎么来的,但就是不知道为什么还要再乘一个5.
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![如果A={-1,0,1}B={2,3,4,5,7}f表示A到B的映射,x+f(x)+xf(x)为奇数的映射有多少个答案是3x5x5=75.我只知道3x5是怎么来的,但就是不知道为什么还要再乘一个5.](/uploads/image/z/8633401-25-1.jpg?t=%E5%A6%82%E6%9E%9CA%EF%BC%9D%EF%BD%9B%EF%BC%8D1%2C0%2C1%EF%BD%9DB%EF%BC%9D%EF%BD%9B2%2C3%2C4%2C5%2C7%EF%BD%9Df%E8%A1%A8%E7%A4%BAA%E5%88%B0B%E7%9A%84%E6%98%A0%E5%B0%84%2Cx%EF%BC%8Bf%EF%BC%88x%EF%BC%89%EF%BC%8Bxf%EF%BC%88x%EF%BC%89%E4%B8%BA%E5%A5%87%E6%95%B0%E7%9A%84%E6%98%A0%E5%B0%84%E6%9C%89%E5%A4%9A%E5%B0%91%E4%B8%AA%E7%AD%94%E6%A1%88%E6%98%AF3x5x5%EF%BC%9D75.%E6%88%91%E5%8F%AA%E7%9F%A5%E9%81%933x5%E6%98%AF%E6%80%8E%E4%B9%88%E6%9D%A5%E7%9A%84%2C%E4%BD%86%E5%B0%B1%E6%98%AF%E4%B8%8D%E7%9F%A5%E9%81%93%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%98%E8%A6%81%E5%86%8D%E4%B9%98%E4%B8%80%E4%B8%AA5.)
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