x²+2x≥0
    4x-1/3-x>1
    5a-a*ln(a)-4>0
    （x+800-2500-5213.15-4455.78）*（1-0.25）/（100000*0.3*0.9）≥0.12
    6x-x²≥16
    a^4-2a^2-4a<0
    x^2+x>0
    4x-x²-4＜0
    （5+x）*(60-2x)＞450
    x²-25x+25＞0
    x2-25x+25＞0
    -15000+W-W×8%/42≥4500
    lnx＞0
    （1/2）^x＜1
    ln（x-3）≤2
    8≥154.23152x
    1+1>1
    a²-4a＜0
    ln（2x+6）大于等于0
    x²－x+1/4＜0

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