0<（x-2）∧2<=4
    x²减4x加7≥0
    abs（5-1/x）<1
    5-1/a<1
    -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)

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