100*(x+20*100)
    11*(x+20*11)
    10*(x+20*10)
    9*(x+20*9)
    8*(x+20*8)
    7*(x+20*7)
    6*(x+20*6)
    5*(x+20*5)
    3*(x+20*3)
    4*(x+20*4)
    3x^2+5x＞2
    x^2-30＜x
    4*(x+20*4)>x*lgx
    3*(x+20*3)>x*lgx
    2*(x+20*2)>x*lgx
    1*(x+20*1)>x*lgx
    2x>=2
    4k^2-12k+12>0
    6x∧2＋6x－24≧0
    3/2[2/3(1/3y-3)-6]>=7/3y-1 y>-11/2

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