abs(x-1)≥abs(x)+2
    abs(x-1)≥abs(x)
    8+x>59
    3x^2+x-4＞0
    80X＋22.4X≧6750
    80（X＋22.4X）≧6750
    n(n+1)/2<1000
    n(n+1)/2<2000
    n^2+n<2000
    0.99
    23+x>=98
    arcsin(x^2+2)<5
    1^x+arccossqrt(x^2+2)>4.15
    abs(cosx-1+1/2x^2-1/24x^4)<1/999
    abs(sinx-x+1/6x^3-1/120x^5)<1/9999
    abs(ln(1+x)-x+1/2x^2-1/3x^3)<1/99
    abs(ex-1-x-1/2x^2-1/6x^3)<1/99
    X（x+2）>x（3-x）+1
    X²+6x+10>0
    4x^2-20x+43＞0

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