若函数形式为f(x,y)=a(x)b(y)+c(x)d(y),其中a(x) ,c(x) 为关于x 的多项式,b(y),d(y)为关于y 的多项式,则称f(x,y)为P类函数,判断下列函数是否为P类函数,并说明理由.(1) 1+xy(2)1+xy+x^2y^2 (1+xy+的后面是x的平方
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![若函数形式为f(x,y)=a(x)b(y)+c(x)d(y),其中a(x) ,c(x) 为关于x 的多项式,b(y),d(y)为关于y 的多项式,则称f(x,y)为P类函数,判断下列函数是否为P类函数,并说明理由.(1) 1+xy(2)1+xy+x^2y^2 (1+xy+的后面是x的平方](/uploads/image/z/1982482-34-2.jpg?t=%E8%8B%A5%E5%87%BD%E6%95%B0%E5%BD%A2%E5%BC%8F%E4%B8%BAf%28x%2Cy%29%3Da%28x%29b%28y%29%2Bc%28x%29d%28y%29%2C%E5%85%B6%E4%B8%ADa%28x%29+%2Cc%28x%29+%E4%B8%BA%E5%85%B3%E4%BA%8Ex+%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8F%2Cb%28y%29%2Cd%28y%29%E4%B8%BA%E5%85%B3%E4%BA%8Ey+%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8F%2C%E5%88%99%E7%A7%B0f%28x%2Cy%29%E4%B8%BAP%E7%B1%BB%E5%87%BD%E6%95%B0%2C%E5%88%A4%E6%96%AD%E4%B8%8B%E5%88%97%E5%87%BD%E6%95%B0%E6%98%AF%E5%90%A6%E4%B8%BAP%E7%B1%BB%E5%87%BD%E6%95%B0%2C%E5%B9%B6%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1.%281%29+1%2Bxy%282%291%2Bxy%2Bx%5E2y%5E2+%281%2Bxy%2B%E7%9A%84%E5%90%8E%E9%9D%A2%E6%98%AFx%E7%9A%84%E5%B9%B3%E6%96%B9)
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