lg(1/x)>5
    lg(1/x)>5
    20lg(1/x)>100
    20lg(5/x)>100
    lg(5/x)>5
    -x²+4x＜5
    x²-2x+1＞0
    -3x²+x+1＞0
    6x²+5x＜4
    20x²-41x+9＞0
    6x²+25x+14＞0
    12x²-20x+3＞0
    4x²+-9＞0
    12x²+16x-3＞0
    9x²+6x-8＞0
    4x²-21x-18＞0
    4x²-29x-24＞0
    10x²+x-2＞0
    10x²-7x-12＞0
    3x²+16x-12＞0

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