2240/x<481/45
    1/x<481/45
    x<1280/144+1.8
    0<2240/x<1 x<1280/140+1.8
    0<2240/x<1280/140+1.8
    0
    0＜x<1280/140+1.8
    2240/x<1280/140+1.8;x>0
    2240/x<1280/140+1.8 x>0
    2240/x<1280/140+1.8 x>0
    2240/x<1280/140+1.8
    x<1280/140+1.8
    x<1280/138+1.9
    x<1280/128+1.9
    x<1280/128+3.5
    x<1280/8+3.5
    absx<4e
    absx
    absx≥0
    absx>0

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