（39.402+x）×1.95＝39.402+72.104-x
    （39.402+x）×1.75＝39.402+72.104-x
    （39.402+x）×1.55＝39.402+72.104-x
    V=397.78+0.726569V
    1/x-[1/x]
    -0.001*√0.25*10^8=10^-x-10^x
    0.001*√0.25*10^8=10^-x-10^x
    2x=6
    X/135-(100-x)/500=0.25
    X/87-20/277-(60-X)/500=0.247
    10^-x-10^x=0.0005*√10^8
    10^-x-10^x=-0.0005*√10^8
    X/126-20/277-(75-X)/500=0.247
    10^-x-10^x=0.0005*√10^8
    1/3x+1/2（132-x） = 59
    1/3x+1/2（132-x）=59
    a×0.6=50.9
    a×0.6=39.8
    a×0.6=28.8
    a×0.6=16.8

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