-1/9x²-1/6x-1 怎么因式分解?
人气:381 ℃ 时间:2020-03-28 23:42:08
解答
-1/9x²-1/6x-1 =-(1/9x²+1/6x+1)=-(1/3x+1)^2不对吧不好意思,算错了-1/9x²-1/6x-1 =-1/18(2x²+3x+1)=-1/18(2x+1)(x+1)1/18(2x²+3x+1)中的1不对吧去括号后为-1/9x²-1/6x-1/18-1/9x²-1/6x-1 =-(1/9x²+1/6x+1)=-(1/3x+1/4)^2-15/16 =[i*(根号15)/4]^2-(1/3x+1/4)^2=(i*(根号15)/4-1/3x-1/4)(i*(根号15)/4+1/3x+1/4)只能这么分解了
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