(272-x)/(44-x) > 8
    (272-x)/(44-x) < 8
    5x^2-14-3≥0
    （x+6÷5）-2*x<=3
    x+6/5-2x<=3
    4m²+2m+2≥0
    2/3<((4k-2)(k^2+1)^(1/2))/(2k^2+1)<3/4
    2(a^2+1)>3a^2+1/3
    (18k)^2-4(k+1)(81k-9)>0
    a^2+4a+1<0
    x^2-4abs(x)+1<0
    4abs(a) >= 3a^2+1/3
    3a^2+1/3>=a^2+1
    2(3a^2+1/3)>a^2+1
    5<-7/2k<=6 -4<=-7/2k<-3
    (a+3)/(5-a)>=1
    abs(2x+1)>5
    5sinx>2cos2x-4
    2/2x+1>1/21
    （2x-1）/3-(5x+1)/2<=1

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