e^x-1-(x+x^2)≤0
    e^x-1-(x^2+0.5*x^3)≤0
    e^x-1-(2/3*x^2+1/3*x^3)≤0
    e^x-1-(1+x+x^2)≤0
    e^x-1-1.5*(x+0.5*x^2)≤0
    e^x-1-1*(x+0.5*x^2)≤0
    e^x-1-2*(x+0.5*x^2)≤0
    e^x-1-2*(2+x)≤0
    e^x-1-0.5*(2+x)≤0
    e^x-1-0.8*(2+x)≤0
    e^x-2*(1+x)≤0
    x^3/27-x+1>0
    2.5x*x*x/(4-x*x)+x*x+1.5x+1>0
    16x+1200-12x≤1200*2/7
    16x+1200-12x≤1200*7/2
    (x-5)/x≤0.8
    x-5/x≤0.8
    k/2≤5k-1
    1.5x+(2.5x*x*x/(4-x*x))-x*x+4<0
    32k^(2)减去16k减3小于0

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