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
    (237960*（120+x）)÷（-0.5*x^4+55.5*x^3-532*x^2+36088*x）＜244
    2x-2>-4
    2x-2>-5
    n∧2＋9n-190≥0
    3/2+x>=2/2x-1
    3/2+x+1>=2/2x-1
    2/2+x>=3/2x-1
    2（x+5）<3(x-5)
    x²-1≥0 1-x²≥0
    0
    x(x+1)＜1

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