0.5X-3>-14-2.5X
    6/1*X-1-1<2/1X
    4*(X-1)<2X-6
    5X-2>3
    x^3-2x^2-3x-3>0
    x+1/x>4.25
    4x x>8
    -3/x<1
    lnx-x＜0
    lnx-x＞0
    3x-1<5
    2sqrt(m^2+m)≥m
    2sqrt(m^2+m)≤m
    2sqrt(m^2+m)/m≤1
    2x²+x-1≥0
    900×［(1+x)^10-1］/x（1+x）^10>3000
    1.1*1263.15*10^6≤22.4*990*x*(820-x/2)
    1.1*3422.91*10^6≤22.4*1240*x*(1010-x/2)
    62656.25≤820x-x^2/2
    1093200-50000-450000-X≥30000

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