-x^2-50x-450=0
    （X-800-300）*（1-25%）/2200=0
    0.75X-600-225/2200=0
    0.75X-600-225/2200=0
    1400/（1+x）^5=1050
    1400/（1+x）^5=1050
    1400/（1+x）^5=1050
    ln(x)＝7.377906977
    ln(x)＝3.409883720
    x/5+5.4=x-783
    783+x=10x-5
    783+x=10x-5
    1-3/2*x=3*x+5/2
    1/4*x=1/2*x+3
    1/4*x=1/2*x+3
    1/4*x=1/2*x+3
    1-x=5
    2x+1=8
    32x=0
    ax=3

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