2lnx＞xln2
    2.3n>2.2n
    5- x/2 > 13x >= 3x-2
    x/3 - x/2 >11
     -12500+x-（50000+x)*1%≥5000
    (3/4)((1/2)(2x-1)-(1/3))>=2
    z大于等于48-z 3(48-z)加5z小于等于200
    90z+100(20-z)小于等于1920
    90z+100(20-z)小于等于1930
    40－12m小于(24-20m)/16
    2-a＞0 2a加3大于0
    9x+4(50-x)≤360 3x+10(50-x)小于等于290
    2.9736a+722.9 ＜3.2667a
    -x^2+x+2＞0 -6x^2+x+1＞0
    −6x^2+x+1＞0
    -x^2+x+2＞0
     sqrt(xx+2)-sqrt(xx+1) >0
     sqrt(xx+1)-sqrt(xx+2) >0
     sqrt(xx+1)+sqrt(xx+2) >0
    2-(1/x)＞0

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