1.544>1/(1/x+1/3+1/71+1/1.3)>0.8656
    6.8>(x/(x+1))*11.2>5.2
    25-2x+1≤16
    10x+12(20-x)>=235
    2000*75%x>80%(x-1)*2000
    2000*75%x>80%(x-1)
    a>25-a
    -(25-a)+4a>=90
    25(40-A)+35A<=1100
    x^2-x+2＜0
    （x-2）^2≤0
    （x-1）^2＞x-1
    4/3y≤70≤3/2y
    3x^2-12x+8<0
    x+1>5 x-1<2
    （S-9）/S＞0.55
    6√2-3x-4+√2x<0
    x>3 x<5
    3x^2+6/(x^2-2) < 6sqrt(2)
    3x^2+6/(x^2-1) < 6sqrt(2)

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