1/tanx
    y = -0.006ln(3000) + 0.1077
    y = -0.006ln(100000000) + 0.1077
    y = -0.006ln(100000) + 0.1077
    100000 = -0.006ln(x) + 0.1077
    30*(t-10）/60-20*（t+12）/60
    30*(t-10）/60-20*（t-10）/60
    arctan （-x）+arctan （2x/3）=90
    arctan x+arctan x/2=90
    1430x^2-1043900x+134000000=0
    1.4x=135%-1 3/5x
    30%x=3-7/10x
    43%x -18%x =0.975
    (11-10)*400+（11.5-10)*200-(12-y)*500=600
    290x=365
    x+0.09x=398
    x+1.09x=398
    x+0.06x=11088.91
    (48+x)/(89+x)=0.55
    (48+x)/(89+x)

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