大哥大姐高分.3Q思密达.= =已知多项式a+b,当a=2,b=-3,b=2时它的值都是-1.我们将这样的把代数式中未知数的取值互换而值不变的多项式称为对称多项式,请写出xy的对称多项式各两个1.二次二项式.2.
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![大哥大姐高分.3Q思密达.= =已知多项式a+b,当a=2,b=-3,b=2时它的值都是-1.我们将这样的把代数式中未知数的取值互换而值不变的多项式称为对称多项式,请写出xy的对称多项式各两个1.二次二项式.2.](/uploads/image/z/13557751-7-1.jpg?t=%E5%A4%A7%E5%93%A5%E5%A4%A7%E5%A7%90%E9%AB%98%E5%88%86.3Q%E6%80%9D%E5%AF%86%E8%BE%BE.%3D+%3D%E5%B7%B2%E7%9F%A5%E5%A4%9A%E9%A1%B9%E5%BC%8Fa%2Bb%2C%E5%BD%93a%3D2%2Cb%3D-3%2Cb%3D2%E6%97%B6%E5%AE%83%E7%9A%84%E5%80%BC%E9%83%BD%E6%98%AF-1.%E6%88%91%E4%BB%AC%E5%B0%86%E8%BF%99%E6%A0%B7%E7%9A%84%E6%8A%8A%E4%BB%A3%E6%95%B0%E5%BC%8F%E4%B8%AD%E6%9C%AA%E7%9F%A5%E6%95%B0%E7%9A%84%E5%8F%96%E5%80%BC%E4%BA%92%E6%8D%A2%E8%80%8C%E5%80%BC%E4%B8%8D%E5%8F%98%E7%9A%84%E5%A4%9A%E9%A1%B9%E5%BC%8F%E7%A7%B0%E4%B8%BA%E5%AF%B9%E7%A7%B0%E5%A4%9A%E9%A1%B9%E5%BC%8F%2C%E8%AF%B7%E5%86%99%E5%87%BAxy%E7%9A%84%E5%AF%B9%E7%A7%B0%E5%A4%9A%E9%A1%B9%E5%BC%8F%E5%90%84%E4%B8%A4%E4%B8%AA1.%E4%BA%8C%E6%AC%A1%E4%BA%8C%E9%A1%B9%E5%BC%8F.2.)
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