r*r/100/14.50/14.50=0.366*50*24*(lg(r)-lg0.175)/77/14.50
    X²-3X-3=0
    24x^2-28x+6=0
    mod(10,3)
    10mod3
    10 mod 3
    x-sin2x=3π/2
    x-sin2x=π/2
    x-sin2x=π/2
    y=y
    1=x
    x-sin2x=π
    x-sin2x=π
    r*r/100/10/10=0.366*50*24*(lg(r)-lg0.175)/51/10
    r*r/100/7/7=0.366*50*24*(lg(r)-lg0.175)/51/7
    r*r/100/5/5=0.366*50*24*(lg(r)-lg0.175)/51/5
    r*r/100/23.40/23.40=0.366*50*24*(lg(r)-lg0.175)/51/23.40
    r*r/100/23.40/23.40=0.366*50*24*(lg(r)-lg0.175)/51/23.40
    （74-x）*（172+2*x)=11000
    （r*r/100/5*5）=0.366*50*24*(lg(r)-lg(0.175))/51/5

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