30+1.8×（59-x）<30+1.8×（45-x）
    240.898>(250.4a+3200)/(a+25)
    -2≤t^(2)-3t≤7
    x^(2)-3x+4<0
    x^(2)-13x-48>0
    x>x^(2)-2
    1/(x^2+1)-1/(x+3)
    x^2-5x+9>0
    log(3,(4x+1)/(2-5x))>2
    x*x-3x-4<0
    -0.001x-0.001x+1>0
    -0.01x-0.01x+1>0
    -4x-4x+1>0
    （12960-4.4x）除以34.3x乘以100%=3.8%
    1≤sqrt5a^2+9-12a
    x^2+2x+2>0
    -x^2+x+2>0
    6x^2-23x+21<0
    x^2>3x-2
    x^2-10x+9>0

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