（x+1）/3>=(3-x)5
    x＋6
    50*x-x^2≥2√50x-(-x^2)
    50x-2*x^2>=600
    50x-x^2>=600
    (1100x-700)×700≥70
    2（x－1）>2
    2（x）
    26700 + X - X * 10 % / 12 * 3 >50000
    1/2x-1<7-3/2x
    (1-0.05)x>1.5
    4a^2>0
    4^2>0
    44^2>0
    24m^2-12m-11≥0
    (x-2)^2>0
    2+3/8x+3大于等于3-2x/4-1
    2（x-1）≤3x+1
    (x＋2)/5-(x-1)/4≥0
    （y-3）/2≥（2y-1）/3-1

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