0.5a^2<1
    49x²+9600x-36000>0
    1-2a^3-3a^2>0
    (20-x)/2*x≥42
    1+2a^3-3a^2>0
    1-2*lnx>0
    2^2n+n^2>1002
    4^-x+3≤1/16
    （1+x）^4>(1+0.4%)^12
     n(n-1)/2 >= 100
    2060/(220+60x)<5
    2060/(660 + 180x)<5
    740/(660+180x) < 5
    x2-6x-7<=0
    2a²≤5sqrt(a²-1)
    2a²≤5(√a²-1)
    2a²≤5√a²-1
    0 <0.3-0.102÷650×12-12×2×10^(-4)×(x^3-15x^2+48x) <0.2
    0 <0.3-0.602÷600×12-12×10^(-4)×(x^3-18.75x^2+75x) <0.2
     0<0.3-0.102÷650×12-12×2×10^(-4)×(x^3-15x^2+48x) <0.2

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