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100華江高中

回復 25# Ling 的帖子

第3題
  1+xn=C0n+C1nx+C2nx2+C3nx3++Cnnxnn1+xn1=C1n+2C2nx+3C3nx2++nCnnxn1nx1+xn1=C1nx+2C2nx2+3C3nx3++nCnnxnnk=1kCkn3k=3n4n1390000n=73n4n1=2146=86016390000n=83n4n1=2447=393216390000

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