y^4-y^3+y^2+y-1=0
    x-0.08*x=3404
    x^1/2＝lnx
    1/（d＋1）＝1/(d＋4)＋1/(d＋2)＋2/d
    V=50+49.59+0.87V
    V=50+50+0.87V
    tanx = 0.68
    500X+1800X=17840.64
    0.6%x=10×0.8%
    tanx = 0.71
    tanx = 0.65
    P 1= C(49,7) C(10,4)
    55%x=0.13
    55%x=1.3%x
    x+4+20+15%x+（x+15%x）*13%=2600
    55%x=1.3%
    x*0.79*2.79*1.05=2.8
    x-10%x=1.2%
    x*0.81*2.49*1.01=1.85
    x-5%x=2.5%

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