(750-w+15)*280500>(500-w+15)*388500
    (500-w)*388500>(750-w)*280500
    (750-w)*280500>(500-w)*388500
    16+a<5
    64x+1920＜80x+1680
    x^2-x>=0
    (480-w) * 30400 > (380-w) * 76000 (480-w) * 30400 > (280-w) *152000
    (480-w) * 30400 > (380-w) * 76000
    （C+1）/6＞C*C
    （C+1）/6＞C
    （3，2）＞C
    C（3，2）＞C
    30400(p-480)-608000>152000(p-300)-3040000
    30400(p-480)-608000>76000(p-400)-1520000
    76000(p-400)-1520000>30400(p-480)-608000
    152000(p-300)-3040000<76000(p-400)-1520000
    76000(p-400)-1520000<152000(p-300)-3040000
    152000(p-300)-3040000>30400(p-480)-608000
    152000(p-300)-3040000>76000(p-400)-1520000
    152000p-3040000>30400p-608000

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