计算3x^3-(x^2 +2x)(3x-1)-3(x+5)(x-2)

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计算3x^3-(x^2 +2x)(3x-1)-3(x+5)(x-2)

计算3x^3-(x^2 +2x)(3x-1)-3(x+5)(x-2)
计算3x^3-(x^2 +2x)(3x-1)-3(x+5)(x-2)

计算3x^3-(x^2 +2x)(3x-1)-3(x+5)(x-2)
3x³-(x²+2x)(3x-1)-3(x+5)(x-2)
=3x³-(3x³+5x²-2x)-3(x²+3x-10)
=3x³-3x³-5x²+2x-3x²-9x+30
=-8x²-7x+30
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