(x^2+1)/2≥1
     x^2+1/2≥1
    40a+27(50-a)<=1500
    0.75*200x＜0.8*200(x-1)
    1.5*(20-x)+1.2(30+1.5x)≤69
    1.5*(20-x)+(30+1.5x)≤69
    1.5*(20-x)+(30+1.5x)≤69
    abs(x-1)+abs(x-2)<1/3
    2^x ≥1000
    2^x ≥1002
    2^x-2 ≥1000
    2^x-2≥1000
    2*x-2≥1000
    50≦（10sinx+10）*10*cosx/2
    x^4-4*x^3-4>0
    k^2+4-(((k+2)(k^2+4))/-4k)^2>0
    16k^2-(k^2+4)(k+2)^2>0
    （2n+3）/(4n＾2-3)≦1/n
    10 >0.5*x >3
    10 >0.5*x*(e^(-0.1* ln(1.5*(1-e^(-0.1*x))/0.1/(1-e^(-1.5*x))))/(1-e^(-0.1*x)))>3

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