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计算:[x/(x^-3x)](x^2-9)
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如何计算 (x+1)(x+2)(x+3)(x+4)
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计算:(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
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计算:再问一题:(3x^2+9x+7)/(x+1)-(2x^2-4x+3)/(x-1)-(x^3+x+1)/(x^2-1