20000/x+30000/(x+60)≤250
    3x + 5 > 2x - 3
    x^2-224 x+256<0
    (2a+1)^2-8>0 1/4-(1/2)(2a+1)+2>0 2-2(2a-1)+2>0
    (2a+1)^2-8>0 1+2a+1+2>0 1-2a-1+2>0
    (2a+1)-8>0 1+2a+1+2>0 1-2a-1+2>0
    34<(75+6.3cosx）-（84-6.3sinx）tanx
    34<(75+6.3cosx）-（36-6.3sinx）tanx
    5/2^10<(195.652/(x+195.652)-184.9171/(x+184.9171))*5
    2n-1/（2n＋1)(2n-1）+6≥2n-3/(2n－1)(2n-3)+6
    2x + 5 > 3x - 2
    (1-20x+400/3*x^2-1000*x^3+20000/3*x^4)^2 <1
    (1-10x+100/3*x^2-125*x^3+1250/3*x^4)^2 <1
    (1-5x+25/3*x^2-125/8*x^3+625/24*x^4)^2 <1
    (1-x+1/3*x^2-1/8*x^3+1/24*x^4)^2<1
    (5729322.74+x）/(15711702.16+x)>0.6
    168-X-X*10%*3/4>＝30
    (5729322.74+x/(15711702.16+x)>0.6
    980a+99a^2-100-8000a^3＞0
    0>sqrt(-1)*x>-2

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