x+1/2＜x/3+1
    6-2y小于等于7-3y
    300+0.5y>=318
    y<=50-0.25y
    4x>8x - 10
    x-3／2-x＞0
    (5x+1)/3-3<=x
    62.188+0.04*50/(0.024*x)+(0.024*x-50)^2/(2*x)<67.5
    3X^2-2X-16＞=0
    1-e(-(5000-k)*0.85^k*(1-0.85)-0.85^k)>0.99
    8/x＜4x
    x^2＜-8/x
    x^3＜-8
    8＜-x^3
    8/x＜-x^2
    x-1/2x-3≤1
    60x+40(2x+4)>2400
    5x-(20-2-x)2>=60
    -1/（3+m）<0
    (7-m)^2-4(3+m)>0

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