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在实数范围内因式分解5-9m^2=-x^4-7x^2+

2008-10-15 12:49:08p***
5-9m^2=______ x^4-7x^2+12=________ x^4-36=________ 2x^3-6x=_____在实数范围内因式分解5-9m^2=______x^4-7x^2+12=________x^4-36=________2x^3-6x=_____:5-9m^2=(?

最佳回答

  • 5-9m^2=(√5)^2-(3m)^2=(√5+3m)*(√5-3m) x^4-7x^2+12=(x^2-3)*(x^2-4)=(x+√3)(x-√3)*(x+2)(x-2) x^4-36=(x^2)^2-6^2=(x^2-6)(x^2+6)=(x+√6)(x-√6)(x^2+6) 2x^3-6x=2x[x^2-(√3)^2]=2x(x+√3)(x-√3)
    2008-10-15 13:33:56
  • 5-9m^2=(√5-3m)(√5+3m) x^4-7x^2+12=(x^2-3)(x^2-4)=(x-√3)(x+√3)(x-2)(x+2) x^4-36=(x^2-6)(x^2+6)=(x-√6)(x+√6)(x^2+6) 2x^3-6x=2x(x^2-3)=2x(x-√3)(x+√3)
    2008-10-15 15:46:54
  • 很赞哦! (23)