400*(1+x)^3=480
    7.92×（c+3.2）=12.18c
    x∧3-12x-16=0
    （-9/125）*x^2+(9/250)x+7991/2000=2
    (x+2x)*10=28
    xxxxxxxx+xxx+xxxxxx=1213
    v=1
    (X^2*ln(0.68*3.10/4.07/X))/(1-X)^2/ln(0.32*3.10/3.79/(1-X)) = 1
    (X^2*ln(0.66*2.72/4.07/X))/(1-X)^2/ln(0.34*2.72/2.80/(1-X)) = 1
    X/63＝2/3
    (X^2*ln(0.62*3.41/4.07/X))/(1-X)^2/ln(0.38*3.41/31.7/(1-X)) = 1
    (X^2*ln(0.62*3.41/4.07/X))/((1-X)^2)*ln(0.38*3.41/31.7/(1-X)) = 1
    200/300*（S-300） = 200
    100/300*（S-150）=100
    (105-x)/(ln(90/(x-15))=121.0338552
    （105-x）/ln(90/(x-15)=121.0338552
    x^4-3x^2 = 1
    x^3-3x^2 = -1
    x^3-3x^2=1
    x^3-3x^2=2

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