sqrt(x*(120-x))>54.94
    (x+10)(-10x+200)≥2210
    4+2a+3>=a
    4-2a+3>=a
    13-4x2＞0
    （-a/2）^2+a*(-a/2)+3>=a
    v*v-68v+900<0
    x^2-4>-0.001
    x^2-4>0.001
    2+x>1
    4/sqrt(x)+3<0.01
    4/sqrt(9)+3>0.01
    (x+453.17)/(5446.96+x)=0.25
    x+453.17/5446.96+x=0.25
    (x^4-x^2+1)^(-0.5)-1<0.03
    (x^4-x^2+1)^(-0.5)<0.03
    (x^4-3*x^2+1)^(-0.5)<0.03
    2(x-1)-x>3(x-1)-3x-5
    x=(150000/1.06*0.06-126000/1.01*0.01)*1.12+(150000-x-126000)*15%
    2

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