p^2-3p+3>1.75
    abs(3x-4)-1<=2
    680-30（25/（1+2x）+1+x）≤380 2＜x≤5
    π/6＜（π/15）t-π/2＜5π/6
     x/1.06*0.06*0.5*0.85 > 0.033*0.85*x
     x/1.06*0.06*0.5*0.85 > 0.026*0.85*x
    (16^-1)^x−0.1<0.25
    (16^-1)^−0.1<0.25
    2a^3+9a^2+a≥0
    a^2+a≥1
    (100x)/(10x+1)>0
    100x/10x+1>0
    x^2-5/3x-4＜0
    x^2-3/5x-4＜0
    （2x+1）^2—4（x^2+1）＞0
    0
    0
    （y+7)(y-1)≥0
    x×x＞0
    (278-x)/(45-x) > 8

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