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
    0.5x*(e^(-0.1x)/(1-e^(-0.1x))>3
    10>1.5*0.5/1.4*x*(1/(1-e^(-0.1*x))*e^(-0.1*x)-1/(1-e^(-1.5*x))*e^(-1.5*x))>3
    3n+2√n-300＞0
    3n+4√n-300＞0
    1.5*0.5*x/1.4*(1/(e^(0.1x)-1)-1/(e^(1.5x)-1))>3
    1.5*0.5*x/1.4*(e^(-0.1x)/(1-e^(-0.1*x))-e^(-1.5*x)/(1-e^(-1.5*x)))>3
    n+√n-125＞0

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