0.5x<1
    (1/4)x<1
    x^5<1
    x＾２-4x+4≥0
    x＾２+x+1＞0
    x＾２+x+1≤0
    2x+5<1
    x＾２-7x-5 ≥ 0
    x2＞x
    3x-1≤3-x
    4x^2-x-5<0
    4x^2-x-5>0
    (x-1)^9/（x+2）>0
    40x+30(100-x)>=3400
    140x+110(100-x)<=12800
    （20+2.5×18+0.6×18+10.4×18.1+18.6×3.4+19.7t）×0.276-2×4.5×0.525+10×（16.9+t-1）×（1-0.276）＜0
    abs(-m^2+2*m-2)
    -3<=-m^2+2*m-2<=3
    -3<=-m^2-1<=3
    1-a^2>a-1

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