原式=[(x-1)(3x²+9x+7)-(x+1)(2x²-4x+3)-(x³+x+1)]/(x²-1)
=[(3x³+6x²-2x-7)-(2x³-2x²-x+3)-(x³+x+1)]/(x²-1)
=(8x²-2x-11)/(x²-1)
（3x^2+9x+7）/（x+1）-（2x^2-4x+3)/(x-1)-(x^3+x+1)/(x^2-1)是不是错了?
2个回答
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