1/x=2.035*lg(572871.63*x)-0.91
    1/x=2.035lg（572084.51*x）-0.91
    1/x=2.035lg（508519.57*x）-0.91
    （6-x）^2＝（4x/3）^2+（6-2x）^2
    1/x=2.035lg（508519.57*x）-0.91
    arctanx
    0.4-（1+X）/X*0.035=0
    12+（5-X）/（5-X）=0.3
    12812*1.0389-(12812-X)/(12812-X)=0.1
    x^0.32=17
    x^0.089=17
    x^0.089=2.597
    x^0.089=2.597
    X^0.089=2.585
    2*r*sin（550/2/r）=450
    4000*cos(x)+((670*4000)/(tan(x)*206000*200.96))=4000
    4000*cos(x)+((670*4000)/(tan(x)*206000*200.96))=4000
    4000*cos(x)+((670*4000)/(tan(x)*206000*200.96))=4000
    4000*cos(x)+((670*4000)/(tan(x)*206000*200.96))=4000
    4000*cos(x)+((670*4000)/(tan(x)*206000*200.96))=4000

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