12.21c=（3.2+c）×7.92
    ln（1+x）
    300x-3x=280+150x
    2lg(2/(x√((x^2+1)(0.25x^2+1))))=-lg(5.8)
    2√(5.9049x^2+1)/(x√((x^2+1)(0.25x^2+1)(0.1024x^2+1))=1
    2lg(2/(x√((x^2+1)(0.25x^2+1))))=-lg(7.6)
    2lg(2/(x√((x^2+1)(0.25x^2+1))))=-lg(4.6)
    2√(4.0804x^2+1)/(x√((x^2+1)(0.25x^2+1)(0.1936x^2+1))=1
    2lg(2/(x√(x^2+1)(0.25x^2+1)))=-lg(4.6)
    （857+X）/(3747+X)=23.79%
    x√((x^2+1)(0.25x^2+1))=2
    1.5x+x+｛（1.5x+x）/2-280｝=5000
    3.8207=（（24.1*0.449（x+0.1））/（1+0.449（x+0.1））*（（100-9.66-1.06）/100）*（1/(1+0.31*1.06）+（（2.86（x+0.1））/（1.36*0.101325））
    （260*63-x）*0.95=13563.15
    arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =arctan (0.839)
    arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =arctan(0.839)
    arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =arctan(-0.839)
    arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =-140
    360/(4x)+3=360/(3x)
    360/4x+3=360/3x

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