-x+√(x＾2-4）≤2
    －x-√(x＾2-4)≥4
    －x+√(x＾2-4)≥4
    －x+√x＾2-4≥4
    －x－√x＾2-4≥4
    1x+1<1
    x-1%+x>61
    x-1%>61
    -50-(100+x)*1%+x>10
    x≥1，x＋1／x＋1／（x2＋1）
    3*(x+6)/(x+10)>=2
    x>10000000/x
    e2x+3>1
    sqrt(x^2-8)＞2-x
    sqrt(a^2-8)＞2-a
    4x-5(2x+3)>5x-1(x-3)<3x-2(x-4)>2x-1
    4x-5(2x+3)>5x-1(x-3) 3x-2(x-4)>2x-1
    4x-5(2x+3)>3x-2(x-4)>2x-1
    4x-5(2x+3)>3x-2(x-4)
    4x-5(2x+3)>0

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