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
    （r*r/100/23.40*23.40）=0.366*50*24*(lg(r)-lg(0.175))/51/23.40
    2x+140-4x=94
    X^X^5＝100
    20÷x=20÷(x+3)+4
    2X=13
    2x²+5x-13=0
    (x+5)(x+7)=89999
    5x^2-60x+2560000=0
    5x^2-60x+256=0
    sin(cos(x))=x
    0.3x+12=0.55x

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