ln(m/2)>m/8
    -(m-3)/m>0
    x+13 <7x-5 <4x+19
    x+13<7x-5<2x+19
    x+17<5x+5<3x+13
    x*5-2>38
    2x+8<30
    6x-3<15
    3x-6<12
    2x-8>14
    2x+8>12
    3x+6>12
    0.25*30^(1-x)+0.75*60^(1-x)<45^(1-x)
    0.25*30^(1-x)+0.75*60^(1-x)>40^(1-x)
    0.25*30^(1-x)>40^(1-x)
    1+x>1
    0.25*30^(1-x)+0.75*60^(1-x)-40^(1-x)>0
    3/2x>50
    3/2>50
    sqrt(（237960*18*1.22÷（-0.5*x^4+55.5*x^3-532*x^2+36088*x））^2+（661*7÷50.4÷x）^2）＜200

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