x-2 √3x+3>0
    -x^2-x-1<0
    (x+1)(x-2)>0
    2x-1/3≥3x＋2／4-1
    －3×a2＋4×a＋20＜0
    （a＋2）2－4×（a2－4）＜0
    3(x-1)+2<=5x+3
    √(3x+1)>=√(x-3)
    (158046+2*c)/(72036+c)-(257463+3*c)/(158046+2*c)<0.5
    x+1≥3x-3
    4x＞2x-6
    (x+1)/(x-5)>0
    160a+10(50-a)>=4100
    800a+60(50-a)<=22240
    2√3tanx+2-2tanx>0
    2√3x+2-2x>0
    -2x∧2-2x+3＜0
    x+1＞2x-6+4
    5x+2≥4x-1
    6+x-2＜6

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