每道题每小题都要答,只要有详细让人一目了然的过程和准确的答案,我会追加50分.1.一个长方形的面积是3(x^2-y^2)如果它的一边长为(x+y),求它的周长.2.已知m+n=5,mn=6,求下列代数式
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![每道题每小题都要答,只要有详细让人一目了然的过程和准确的答案,我会追加50分.1.一个长方形的面积是3(x^2-y^2)如果它的一边长为(x+y),求它的周长.2.已知m+n=5,mn=6,求下列代数式](/uploads/image/z/1271863-55-3.jpg?t=%E6%AF%8F%E9%81%93%E9%A2%98%E6%AF%8F%E5%B0%8F%E9%A2%98%E9%83%BD%E8%A6%81%E7%AD%94%2C%E5%8F%AA%E8%A6%81%E6%9C%89%E8%AF%A6%E7%BB%86%E8%AE%A9%E4%BA%BA%E4%B8%80%E7%9B%AE%E4%BA%86%E7%84%B6%E7%9A%84%E8%BF%87%E7%A8%8B%E5%92%8C%E5%87%86%E7%A1%AE%E7%9A%84%E7%AD%94%E6%A1%88%2C%E6%88%91%E4%BC%9A%E8%BF%BD%E5%8A%A050%E5%88%86.1.%E4%B8%80%E4%B8%AA%E9%95%BF%E6%96%B9%E5%BD%A2%E7%9A%84%E9%9D%A2%E7%A7%AF%E6%98%AF3%EF%BC%88x%5E2-y%5E2%EF%BC%89%E5%A6%82%E6%9E%9C%E5%AE%83%E7%9A%84%E4%B8%80%E8%BE%B9%E9%95%BF%E4%B8%BA%EF%BC%88x%EF%BC%8By%EF%BC%89%2C%E6%B1%82%E5%AE%83%E7%9A%84%E5%91%A8%E9%95%BF%EF%BC%8E2%EF%BC%8E%E5%B7%B2%E7%9F%A5m%EF%BC%8Bn%EF%BC%9D5%2Cmn%EF%BC%9D6%2C%E6%B1%82%E4%B8%8B%E5%88%97%E4%BB%A3%E6%95%B0%E5%BC%8F)
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