arctanw-arctan0.2w
    arctanw-arctan0.2w
    X=(5.38+4.1*0.5)*265.5*0.0028*(32)^0.5
    X=(5.38+4.1*0.5)*81*0.0028*(60)^0.5
    X=(5.38+4.1*0.5)*83*0.0028*(83)^0.5
    （38.78/(40.83+x）*0.3＋0.35*x/(40.83+x))*（40.83+x）/24.74=0.72
    （X-7.35）*（X-7.35）=X*X-400
    2X＋7＝1
    x-x*13%=6594
    (38.78×0.3/(40.83＋x)＋0.35×x/(40.83＋x))×(40.83＋x)/24.74＝0.84
    （1+X/X）5X
    x^3-2x^2-x+1=0
    X/5.5-24=X/6+24
    x/（1-x）=2
    （41.789+x）×0.85＝73.378-x+41.789
    x/（3×10^3-x）=27×16÷80÷6.1
    （42.309+x）×0.85＝71.418-x+42.309
    （42.309+x）×0.85＝72.418-x+42.309
    （42.309+x）×0.85＝73.418-x+42.309
    （42.309+x）×0.85＝74.418-x+42.309

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