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    x/(x+100)=0.335
    x^2-17.1x+72.9=0
    lg(sqrt(2)k/(25sqrt(10025/10000)))=1.2
    lg(sqrt(2)k/(25sqrt(10025/10000)))
    lg(k/25)=1.2
    (153/32)b^2-33b+112=0
    X=2494405-0.2565X
    X=2288341-0.2565X
    X=2391373-0.2565X
    X=2700469-0.2565X
    0.1*x+20=130/1000*x
    X=2185309-0.2565X
    x^2-5.7x+6.6=0
    5000000×79=3000000x
    500×79=300x
    1/x -x =1/2
    (x-129.320)*10-2=1
    5x=(20-5)*45
    1.45=120/(120-x)
    1.45=120/120-x

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