0<180*(n-2)-1680<180
    -（x^2）+2x+3≥0
    1+X^2>=0
    X(X-4)>12
    4X-5>15-X
    (1.002-0.001)^x*(0.998-0.001)^(100-x)>0
    (1.01-0.001)^x*(0.99-0.001)^(100-x)>0
    2^（x-1)≤26≤2^x
    5-2x ≤-3
    5-2x≥3
    3x-1<2
    2x+1<-3
    3x-1≥-3
    5x+3>2
    2^n>=2n^3
    3x+9≥12
    3x-9≤12
    5x-10≥0
    5x-10≥10
    4x-8≥0

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