-a<-4
    -(1÷a)<-4
    -a>1
    （x+1）²＞3
    -4m-19>0
    x^2+2x-23＜0
    （x+4）²－25／4＜0
    x^2-2x+2>0
    3-x>=0 x-2=0
    -1<1/(x-1)<1
    -1
    x+1/2<1/(x-1)
    x+1/2<1/x-1
    2x-3≥6
    1/x>x
    1+(3x+4)(3x-4)<9(x-2)(x+3)
    1<=((73*a^2+28*a+4)^(1/2)+11*a+2)/(4*a)<=4
    1<=-((73*a^2+28*a+4)^(1/2)-11*a-2)/(4*a)<=4
    1<=x+1
    10x-6/x>=28

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