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来源：学生作业帮助网 编辑：作业帮 时间：2024/04/27 17:22:40
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======-27 - 2 x + 3 x^2

x-27.。。

原式=x(x^2-16)-(x+3)(x-3)^2+5x=x^3-16x-(x^2-9)(x-3)+5x=x^3-16x-x^3+3x^2+9x-27+5x=3x^2-2x-27

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