x^3-13x^2+52x-48
    Xx12%+（30-x）×14%=4
    -1/x>1
    x×x+x=48
    tan22.2=(2.5^2*(sinx)^2-1)/(2.5^2*(1.2-(sinx)^2)*tanx)
    x*sqrt(x^2/4+1)*sqrt(x^2/900+1)=10
    t*t*t+4.5t*t-30.5t-60.9=0
    t*t*t+4.5t*t+30.5t-60.9=0
    t*t*t+4.5t*t-30.5t+60.9=0
    t*t*t+4.5t*t+30.5t+60.9=0
    -x^3-7x^2-60x+56
    6x-5/6=4/3
    3x+2/3=14/9
    (P-10)(160-P) + (P-10)(65-0.5P)
    8/9x-2/3x=6
    x:5/6=2/3
    4/3-x=2/3
    3*x=9
    x/5/6=2/3
    (4x^2)/[(0.1-x)(0.1-2x)^2]=0.552

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