x=3
    x+7.64/（x^2） = 17.02
    x+27.58/（x^2） = 17.02
    x-27.58/（x^2） = 17.02
    x-27.58/x^2 = 17.02
    x+27.58/x^2=17.02
    x+4.78/x^2=17.02
    4/5+4/5x=6
    a×a+0.7
    a×a+0.7=
    540/x+540/x^2+540/x^3+540/x^4+540/x^5=1390
    4/5(1+X)=8
    -85x^5+54（x^4+x^3+x^2+x)=0
    12=4/5*x+x
    12=1/2*x+x
    0.8=5/10*x+x
    0.11=0.05319+0.05319*x+x
    50/100（1+x）=0.8
    x²-180x+1200=0
    50/100（1+x）=0.8

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