(9+(4*(1+9*x^2)-9*x)^2)/(1+9*x^2)-16/5
    (9+(4*(1+9*x^2)-9*x)^2)/(1+9*x^2)
    11.28x^3+51.02x^2-251.08x-2400.47=0
    XxX=X
    0.75x+100=0.95x-140
    0.75x+100=0.95-140
    lgx=-0.0362
    11.28x^3+61.09x^2-144.36x-1556.04=0
    (X+1)÷2≤2
    x^(2)-103x+1200
    1.2x<3
    sin(99-a)/sin(a)=2×sin(99)/√3
    sin99-a/sina=2×sin99/√3
    3x-7
    11.28x^3+71.16x^2-37.64x-936.82=0
    2x>1-x
    -100+50/(1+x)+36/(1+x)^2+23/(1+x)^3+11/(1+x)^4=0
    x>（1-x）÷2
    11.28x^3+98.16x^286.35x-624.78=0
    11.28x^3+51.02x^2-251.08x-2401.47=0

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