1÷x≤1÷3
    1÷(2x+1)+1÷(4-2x)≤0
    x+2≥x
    3-2x÷2≤-1÷4
    x^2+2x-1>0
    8-3x^=-10
    3x^2+2x-5≥0
    （3-x)(x+2）>0
    （6-x）(x+2)≤0
    （2x+1）(x-1)>0
    （x-1）(x+2)≤0
    （x-2）(x-3)≤0
    -x^2+2x+3>0
    x^2-2x>=0
    4x^2+{x+2}^2<1
    5x^2+4x+3<0
    t ^ 2 * ln (t^2) <3 * ( t ^ 2 - 1 )
    t ^ 2 * ln t^2 <3 * ( t ^ 2 - 1 )
    2*t^2*lnt<3*(t^2-1)
    t^2*lnt

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