xx > 2x
    x^100=300
    100^x=300
    (x∧(2)-x-6)(x∧(2)-6x+9)>0
    2x^2-3x-2<0
    abs(x-1)+abs(-3)<8
    x^2-x-2≥0
    （x+1）/（2x—1）≤0
    x+1/2x—1≤0
    3x^2—7x—6≥0
    243x^(2)x^(2)-972x^(3)+288x^(2)+1440x－1440>0
    35000×3.1415926×x^3-60x-192>0
    2x+3<4√6
    -4(x^2)+2x-1=0
    （a+2）^2+4(a^2-4) ≥0
    （a+2）^2+4(a^2-4) >0
    4－x^(2)－3x>0
    （a+2）^2+4(a^2-4)
    x^(2)－4－3x>0
    x^2+2x+1+4(2x+1)(7x+4)>0

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