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+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?