-3x-56<-20x^2
    -19x-42<2x^2
    -22x-8<5x^2
    -8<-3x^2+23x
    15x^2-22x<48
    8x^2+38x+35<0
    -5x^2+6<-29x
    -27x<-12x^2+27
    -27<-15x^2-36x
    9x^2+3x-12<0
    -35<10x^2+45x
    -9x^2<-24x+15
    -16x^2+4x<-42
    20x^2<-42x-16
    -5x^2+21x<18
    -x^2+6x<-16
    2x-4>4（x+5）
    x-8/x<2
    tan(x)>-0.5
    （3-2x)/5-(x-7)/6≤2

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