4x-2-9x+3<6
    3（x+1）<2x+6
    472500-472500*(49370-x)/(50370-x)-x>0
    x*x-2x-15<0
    x*x+x-6<0
    5/3x＞（x-3/4）-2
    4/a^2+60.8/a^3≤3.1415926
    4/a^2+30.4/a^3≤3.1415926
    1/2x-1≦1-3/2x
    5x+7＞3（x+1）
    -4(X^2)+6X-9/4<0
    X^2+4X+3>0
    0.5x-1>3-1.5x 2x+1>3x-3
    40m+20(8-m)>=200 10m+20(8-m)>=120
    2-x>0 ((3x+1)/2)>((2x-1)/3)
    15x>33-2(6x-24)
    e^(-r/4)≤0.0001*sqrt(3.14*r)
    -1＜2（1-3x）/3≤2
    logx2≥2
    2-x /x +4>0

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