1600÷w^2÷（0.04*w^2+1）÷（0.0625^2*w^2+1）=1
    π÷2-arctan（0.2*w）-arctan（0.0625*w）=0
    90-arctan（0.2*w）-arctan（0.0625*w）=0
    84.1 = 35.823ln(x) - 4.7894
    50 = 35.823ln(x) - 4.7894
    1-(2094400/x)=0.0116
    4x(x－3.25x×x)∧2÷(1－x－3.25x∧2)∧2＝0.125
    x∧2＋5x＋2250＝
    1-x/1+x
    3=0.009x+2.79
    1.51*(1-x)=0.488
    3=-0.00413x+3.01
    280*(1-x)=163
    3=-0.01697x+3.4
    137*(1-x)=65
    3=0.00766x+2.91
    3=-0.00956x+3.28
    11.52*(1-x)=4.044
    19.8*(1-x)=2.11666666666667
    3=0.00535x+2.92

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