（103.85+（x-3000）/（5000-3000）*（163.9-103.85）*1*1*1.5=3615-x
    4*cosx=e^x
    x+x*0.06=18000
    arctanx等于6.28/3
    arctanx等于120
    arctan2.45等于x
    arctanx等于134.16
    arctanx=134
    159.8/(159.8+x)=(1-3%)
    10^x=7.49×10^(-6)
    10^x=6.54×10^(-12)
    x(x-3)
    (3x+6)/(5x-15)
    0.000026×（0.000013-0.000026x）+0.000085×50×（0.000085x-0.000002）=0
    X/1.09*0.09-X/1.03*0.03=174903.73
    ex²*sinx
    1452000X-1200X^2+219744000=565000000
    452000X-1200X^2+219744000=565000000
    （0.121023222-x)/0.004 = 199.6
    X/1.09*0.09-X/1.03*0.03=36581.83

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