X=54042-(1879+17.8%X)
    arctan(sqrt(2)/8*x)-90=180
    2*sqrt(2)/(x*sqrt(x^2/32+1))=1
    25x=10015x
    (x-x/1.13*0.1)/7.17=0.51
    10*x^2=100*x/sqrt(100+x^2)
    (x-x/1.13*0.1)/7.17=0.489
    5*sqrt(2)*x^2=100*x/sqrt(100+x^2)
    (x-x/1.13*0.1)/7.17=1.72
    (x-x/1.13*0.1)/7.17=0.36
    (2x-6)/1001+(2x-5)/1002+(2x-4)/1003=3
    (x-x/1.13*0.1)/7.17=0.076
    X-X*0.065-X*0.0003=169541.29
    19.6*（1-X^16）/（1-X）=2365.11
    4.58*（1-X^6）/（1-X）=50.9
    4.58*（1-X^6）/（1-X）=27.48
    81×100÷x÷1.05÷90×100=129
    26×100÷x÷1.05÷90×100=42
    1958636+x*8*385=1524600+(350-x)*8*385
    1013286+831600+4*x*385=(350-x)*4*385+1524600

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