计算:(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)的二次方
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![计算:(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)的二次方](/uploads/image/z/3811990-22-0.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%28x%E7%9A%84n%E6%AC%A1%E6%96%B9%2By%E7%9A%84n%E6%AC%A1%E6%96%B9%29%28x%E7%9A%84n%E6%AC%A1%E6%96%B9%EF%BC%8Dy%E7%9A%84n%E6%AC%A1%E6%96%B9%29%EF%BC%8D%28x%E7%9A%84n%E6%AC%A1%E6%96%B9%2By%E7%9A%84n%E6%AC%A1%E6%96%B9%29%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9)
计算:(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)的二次方
计算:(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)的二次方
计算:(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)的二次方
原式=[x^(2n)-y^(2n)]-[x^(2n)+y^(2n)+2*x^n*y^n]=-2(x^n+y^n)y^n