6.46/[1.44x*x-10.56x+18.64]≤0
    6.46/[1.44x*x-10.56x+18.64]≥-1.5
    1.44x*x-10.56x+18.64≤0
    3+6x≤π
    3+6x≤0
    (1.7*3.8)/[1.7*1.7-(1.2x-1.5)*(6.3-1.2x)]≤9
    -1.4≤(1.7*3.8)/[1.7*1.7-(1.2x-1.5)*(6.3-1.2x)]≤0
    -1.4≤(1.7+3.8)/[1.7*1.7-(1.2x-1.5)*(6.3-1.2x)]≤0
    (1.7+3.8)/[1.7*1.7-(1.2x-1.5)*(6.3-1.2x)]≤0
    (1.7+3.8)/[1.7*1.7-(1.2x-1.5)*(6.3-1.2x)]≥-1.4
    1-4*(0.25*m-1)>0
    45z<60(140-z)
    45z<60(45-z)
    ln(2x+1)>x
    5a+11(100-a)=<0.4*[10a+12(100-a)]
    x3-4x2+5x-2＞0
    （x-1）（x+2）＜0
    3(x-1)(x-2)<=2x+2+6x-6
    6/(11-x)(10-x)<1
    6/(11-x)(10-x)>0

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