x^3 - 15x - 4
    x^3-15x-4
    （1+x）
    x^3-15x-4
    X/126-（85-X）/500+10/87=0.256
    X/126-（80-X）/500+15/87=0.256
    X/126-（80-X）/1000+15/87=0.256
    15/133.58+3/44.7+X/1000+（74.3-X）/1650=0.225
    15/133.58+3/44.7+X/1000+（74.4-X）/1650=0.226
    15/133.58+3/44.7+X/1000+（74.4-X）/1650=0.225
    X/126-（80-X）/1000+15/87=0.238
    X/126-（95-X）/1000=0.238
    (1+0.5x)（1+x）^3=2
    4000/(101×0.12+x)+10000/(x)+7500/(x)=150
    8000/(101×0.12+x)+10000/(x)+5500/(x)=150
    8000/(101×0.12+x)+10000/(x)+8000/(x)=150
    8000/(112×0.12+x)+10000/(x)+10000/(112×0.2+x)=150
    8000/(112×0.12+x)+10000/(x)+10000/(112×0.2+x)=150
    8000/(112×0.12+x)+10000/(112×0.2+x)+10000/(112×0.2+x)=150
    7500/(112×0.12+x)+10000/(112×0.2+x)+10000/(112×0.2+x)=150

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