4*x^2+3.2*x-26>0
    5x+7(40-x)<=230
    6x+4(40-x)<=214
    1>x
    m^2+4*m+13>0
    (m+2)^2+9>0
    -7X^2-3x+1>0
    (x+542)*0.165/68+311/(x+542)≤1.25
    log(2,a)<2a
    （x-1)(2x+1)大于0
    10^（（n-17）/2）＞10^（n-6）-10^（-3）
    50×（1+8％）（50－m）+80×0.9m≤3060
    0<-4x^2+25x-36
    -4x^2<-18x+14
    0<3x^2+8x+4
    -20x^2<-57x+27
    26x+56<10x^2
    x-2<-6x^2
    -13x<-20x^2+72
    -56<-6x^2-10x

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