a×0.6=12.6
    18%X+13%×（1-X）=16%
    tanx=1/x
    a×0.6=23.9
    4*（10000+x）+((10000-x)*4+20000*6)*0.03=2*(20000+x)
    a×0.6=20.9
    a×0.6=23.9
    x=3500-x*10%
    a×0.6=20.9
    a×0.6=29.9
    a×0.6=16.9
    a×0.6=15.9
    a×0.6=14.9
    a×0.6=13.9
    a×0.6=12.9
    a×0.6=11.9
    a×0.6=10.9
    (0.32+0.01*(3-2.3/x)/(0.46+1.725/x))*(63*10^0.5)*(x^(3/2))=725.33
    8×n^2=64×n×lgn
    1153110X-105830sin6.28X-203400=0

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