2114.08<18.4*10^3*0.18*x*(1.1-x/2)
    2114.08<18.4*10^3x*(1.105-x/2)
    2114.08<18.4*10^3x*(1.1-x/2)
    2114.08<18400*0.18*x(1.1-x)
    0.1149<1.1x-0.09x^2
    (2n+1)*3^(n+1)>=2020
    0.1149<1.105x-0.09x^2
    0.1149<1.11x-0.09x^2
    0.1149<1.195x-0.09x^2
    3（x－5）+1≤2x
    3（x－5+1）≤2x
    1915.47<13.8*10^3*[0.18x*(1.195-x/2)+1.4*0.11*1.14]
    2114.08<18.4*10^3*[0.18x*(1.195-x/2)+(1.58-0.18)*0.11*1.14]
    2114.08<18.4*10^3*[0.18x*(1.195-x/2)+1.4*0.11*1.14]
    2x+x-1/x＞0
    3x+2-6≥2x+2
    3x-2-6≥2x+2
    3x-2+6≥2x+2
    x+1－2x≥6x+2
    2+0.5x＞0.2+x2.3

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