-e/a>e
    x*0.20833>(1-x)/14
    1/(2+a)>0
    1/(1+a)>0
    12+129>382
    2 x-4<2 3 x-2≥x
    4^4^x≥6^5^5^x
    4^4^x≥5^5^x
    C(8,k)×2^k≥C(8,k-1)×2^(k-1)
    k+1≥2
    e^x+1＞3
    e^x+1＞3
    （x²-2x）e^x＞0
    2x＞1-x
    x^2-2^2>=0
    2/3x+1/2大于或等于1/2x
    X+4/3<=2-x/5
    X/3+4<=2/5-x
    20000*7.0≤20000*(1+4.2%)*(7.0-x)
    4x+x-99≤50

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