x^2*(x^2+1)*(x^2+100)=9
    x/4+8x/4=4.5
    x^2*(x^2+1)=90
    (1+sin60)/(1-sin60)
    90-arctan(0.2*14.1)-arctan(14.1/16)
    x^4+4/3*x^3-1/2*x-2/3=0
    （x-2）^2/3=2/3x
    -0.03*(a^2)+2*a+36=48
    （4x-9）^(2)≤0
    (1-x)*(1-x)-(0.0631-x)*(6.1282-x) = 0
    4/3x+3=-3/8x^2+3/4x+3
    62-x
    -0.03*(a^2)+2*a+36=48*a
    -0.03a^2+2a+36=48a
    a^2=4
    (0.4×0.6×32.5+0.4×0.6×33.6)×25+22×10+(5102.96+9497.86)/1.35/1.1×0.03=
    (0.4×0.6×31.5+0.4×0.6×32.1)×25+20.5×10+(5102.96+9497.86)/1.35/1.1×0.03
    x^3+7x-8=0
    (x-1)*(x-1)-(x-0.0631)*(x-6.1282) = 0
    (x-1)*(x-1)-(x-0.0631)*(x-6.1282)=0

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