15-(1-x+x²)+(1-x+x²-x³),

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15-(1-x+x²)+(1-x+x²-x³),15-(1-x+x²)+(1-x+x²-x³),15-(1-x+x²)+(1-x+

15-(1-x+x²)+(1-x+x²-x³),
15-(1-x+x²)+(1-x+x²-x³),

15-(1-x+x²)+(1-x+x²-x³),
先拆括号原式＝15－1＋x－x＾2＋1－x＋x＾2－x＾3
化简　　　　＝15－x＾3
还是我想的太简单了?