cosx大于等于0
    cosx大于等于-2
    cosx大于-2
    (4/20)+(4/30)+(9/20)+(9/30)*[(10-x)/10]≥1
    x＾x>2x
    x＾x>x
    x＾x>1
    √x<5 x＾x>2
    √x<5 x＾x>2
    √x<5
    x(x-3)>=0
    15－0.5x≥0.2x
    500x－10x²＜6000
    6/x≥x+1
    3x-1>4-10x
    3x-1>2(2-5x)
    0.2<0.002x
    (2m+6)/(m-2)＜0
    x√2-1
    X-3/X-2<0

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