1.05^x>(10/9)
    3+x
    1＞－6÷a
    1＜－6÷a
    -m^2+m-1<0
    -m^2+m-1>0
    （x-2）（x-4）
    （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

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