10000/x+30000/(x+60)≤10000/70
    10000/x+20000/(x+60)≤10000/70
    10000/x+10000/(x+60)≤10000/70
    x^3-4x+3<0
    x+12/(3x-4)>3
    sqrt（x+1）＜2x-1
    1.288231 < x < 2.458733
    100*(e(3*lg(x)/1)-1) > 2
    2x+5>11
    x^2 + 5x - 6 > 0
    3-(3x-6)/5 < (2x+9)/10
    -3/2x+18≥0.5x+2
    x^2 + 3x > 2
    x^2 + 2x - 3 > 0
    x - 2 < 1
    2x + 5 > 3
    x^2 + 4x - 3 ≥ 0
    x^2 + 5x - 6 ≥ 0
    -ln（-a）-a²+1<0
    ln-1/a-a²+1<0

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