3x^2-4x-6＜0
    ln(1/2a)+1-2a≤0
    300+0.9x<0.95x
    2x+1＜-1 3-x≤1
    x-1＞0 4-2x≥0
    -2x+1≥4 x+4＞0
    8-3（x+2)≥2（x-4)
    3x-1≤5 x+1≥0
    2x+9≥3(x+2)
    2x+9≥3
    (X-2000)*1.37≥X*1.36
    4k^2=>3/4
    -lnx>0
    1/1+x＞0
    -3x*x-2x+13>0
    1÷3x+1÷3×(x+1)>1
    2*sin(x) + 5 > 3
    2x^2 - 7x - 3 ≤ 0
    （2024/2023）^2024＞e
    10000/x+20000/(x+60)≤142

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