180-90-arctanx-arctan1/4x=72
    -90=-arctanx-arctan0.25x+arctan50x-arctan2500x
    4.4027=（（25.27*0.53（x+0.1））/（1+0.53（x+0.1））*（（100-8.04-0.86）/100）*（1/(1+0.31*0.86）+（（2.24（x+0.1））/（1.31*0.101325））
    102*x*x+194*x-18=0
    96*x*x+182x-26=0
    96*x+182x-26=0
    xlnx＝15.9
    arctanx+arctan(1/4x)=90
    arctanx+arctan(1/4x)=90
    X/141-（95-X）/1000=0.457
    X/141-（95-X）/1000=0.43
    10^(14)x^(2)+10^(12)x=1+1.77*10^(8)
    10^(14)x+10^(12)x=1+1.77*10^(8)
    8x^2+5+2/x
    x*ln(863/4057.21)=374.18*(-7.66804*(1-x/374.18)+1.84376*(1-x/374.18)^1.5-2.70786*(1-x/374.18)^2.5-3.23384*(1-x/374.18)^5)
    （14092.2+200000x）*1.8=250000000
    8400/(x+102*0.22)+10000/(x+102*0.1)=150
    5x*x+4x=0
    -x*x+2x+3=2.5
    r^2=(r/2+3)^2+36

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