e^x≥lnx
    -5<3-2x
    2x^2-5x-12>=0
    2x^3-5x-12>=0
    1≤1-lnx≤2
    30a+25a+75≥1355
    2a+3≥39
    x(6-2x)^2>12
    x+10000/x≥200
    x+10000/x＞200
    30-x/8.25<6
    20-x/8.25<4
    2-m≥2
    2*x-1/2*x^2-3/2>0
    x＞e10
    4＜log(3,x)＜16
    2＜xx+3x-4＜3＜lgx＜4
    1＜x＜2
    xxx-6xx+11x-6＞0
    480 ≤ 600-4X≤ 520 1200+（8-12X）

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