-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
    sin45x
    sqrt（a）*sqrt（2）*2-a-2>0
    sqrt（a）*sqrt（2）*2-a-2<0
    (1-2a)^2-2a(1-2a)-3>(a+1)^2-2a(a+1)-3
    3a>5
    2x²－x+4＞0
    -1 OR 3*2>(0+5+458-458)

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