ln(1000000000000000000000) 1000000000000000000000^0.1
    ln(10000000000000000000000) 10000000000000000000000^0.1
    ln(1000000000000) 1000000000000^0.1
    ln(10000000) 10000000^0.1
    ln(10000) 10000^0.1
    ln(10000)
    x*x-2x-3<=0
    2x*x+x-6＜0
    x*x-x-6<=0
    ax=1
    x^2=(x-4)^2+8^2
    -x^2/3+3.5*x-1>=3.5
    x^2-5x+2018≥0
    x^2-7x+2022≤0
    14x<1
    4a^2-4a>0
    b^2+6b+16>0
    （6k)^2-32k<0
    （6k)-32k<0
    -3x^2+8x<4

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