a∧2-1/4＞0
    -x^2+4x+7＜0
    1.3*（x+0.5）＞1.5*x
    4x^2-3x≤0
    (x-60)(120-x)>=500
    4x+15≥5x+13
    1.6*x+1.2*(80-x)<=112
    11.1/10=tanx （0＜x＜180
    （x-1)ex+2(x-1)>0
    (x-1)(x+2)(x-2)>0
    x(x+2)(x-3)<0
    0.78-1.2*t>-2*(t-0.5)^2+4+(2*(t-0.5)^2+1.4)*1.5/(t-4)+(8*(t-0.5)^2-5.6)/(t-4)
    a+3/(2*a)≥2
    a*(2*a^2-a-3)>0
    (2a^2-a+3)/(2a)>1
    -1.5x>6
    4x^2≤3
    2x^2-x-1>=0
    3-x^2>0
    5/（x+1）小于1

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