-12x∧2+4x+4＞0
    -12x∧2+4x+5＞0
    32x^2-40x+9<0
    1/x-1+1>1/2
    4/7≤x×x-2x+4≤7
    (1000*1.03^(x-1))1.03＜2*1.05^(x-1)
    (1000*1.03^x)1.03＜2*1.05^(x-1)
    (1000x1.03^x)1.03＜2x1.05^(x-1)
    lg x＜1
    2x∧2－7x+3＜0
    x/173^2≤23.9
    10x^2+100x+10000<2^32
    n(n-3)<40
    2018<-2019/a<2019
    0<-1/a<1
    3x*x+2x ＞0
    9*(x^2)+6*x+1≤0
    9x^2+6x+1≤0
    -2a+1<0
    4-2*（m+1）+m-2<0

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