4X-4<3X+2<4X
    -62845 * x + 760 * ( 450 - x ) > -0.4 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.32 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.4 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.3 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.2 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.1 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.4 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.5 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845 * x + 760 * ( 450 - x ) > -0.3 * ( 150000 * x + 15000 * ( 450 - x ) )
    -62845x+760(450-x)>-0.2*(150000x+15000*(450-x))
    -62845x+760(450-x)>-0.2*(150000x+15000(450-x))
    2X²+3X≥0
    （56－2x）x≥360
    X²-2X+1>0
    X²-3X+5>0
    4X²-12X+9<0
    2X²-5X-3<0
    3X²+5X>0
    X²≤2

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