是不是计算 x^(n-1)·[3x^n+4x^(n+1)-5x^(n+2)]
=3x^[n+(n-1)]+4x^[(n+1)+(n-1)]-5x^[(n+2)+(n-1)]
=3x^(2n-1)+4x^(2n)-5x^(2n+1)
=(3+4x-5x²)·x^(2n-1)
x^n-1(3x^n+4x^n+1-5x^n+2)
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