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
    4x+x-99<50
    sinx＞cosx+1
    x(ln(1+x)-ln(1-x))≥1+cosx+(1/2)x^2
    x(ln(1+x)+ln(1-x))≥1+cosx+0.5x^2
    (1200+x)*110*1.4>250000
    (600+x)*1.4*25>250000
    (1200+x)*1.4*1.55*25>250000

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