x*(1-250*x)=0.05926
    x*(2000-250*x)=118.520
    250+(98/x) = 266
    250+98/x = 266
    401-(304/x) = 336
    227+(138/x )=242
    X（1-60%）-2500=1415
    （120000-110500-x）/120000*100%=10%
    12.9*x^2+0.7*x-3=0
    12.9*x^2-7.9*x-5=0
    (3-3*x)^5.3=39.4*x
    0.95543=cosx
    cosx＝0.95543
    5x^2+3800x-118500=0
    a×0.6=29.9
    a×0.6=17.8
    a×0.6=10.9
    a×0.6=6.9
    a×0.6=7.9
    x/（1-x^2）^0.5=0.7665

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