（5-3X）（3-X）<0
    （5+2X）（3-X）<0
    （X+5）（3-X）>0
    -X＾2+4X>0
    -X＾2-2X+6>0
    -X＾2-2X+1>0
    -X＾2-X+1>0
    -X＾2-X+3>0
    -X＾2-X+4>0
    -X＾2-X-2>0
    -X＾2+X-2>0
    -X＾2+X-4>0
    -X＾2+4X-4>0
    -X＾2+4X-4<0
    10X＾2-33X+20<0
    X＾2-2X<0
    X＾2-X+2<0
    X＾2-X+5<0
    X＾2-4X+5<0
    -2X＾2-6X<0

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