计算:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)=(1/X^2+9X+20)应该是:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)+(1/X^2+9X+20)
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计算:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)=(1/X^2+9X+20)应该是:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)+
计算:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)=(1/X^2+9X+20)应该是:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)+(1/X^2+9X+20)
计算:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)=(1/X^2+9X+20)
应该是:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)+(1/X^2+9X+20)
计算:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)=(1/X^2+9X+20)应该是:(1/X^2+3X+2)+(1/X^2+5X+6)+(1/X^2+7X+12)+(1/X^2+9X+20)
化简得2/x^2+6x=0,即(1+3x^3)/x^2=0,所以x=-(1/3)^(1/3)
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