（x-179）/159<（x-175）/175
    1/4x^2-x-1>=0
    3s^2+16s+20=0
    4x+12=6x-52
    450-(450-50)X(334+50)=
    450-(450-50)X(334+50)=237
    a^2-3a+2>0
    a^2-4/a>0
    a^2-4a+8>0
    4x+3=4x-5
    t^2/10^2=((t-5)^2+100^2)/100^2
    a+1=2
    1+1
    780*1.5-1.5*300<（390-300+175）*x
    780*1.5-1.5x<390-x+175
    1170-1.5x<780-x+175
    3000-1.5x<1000-x+175
    1170-1.5x<390-x+175
    sqrt（x^2-3*x+1）+ sqrt（2*x^2+2x*-5)< sqrt(3*x^2+7*x-11)+ sqrt(7-8*x)
    （x^2+x-2)/2<2002

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