0.01=8.2X^(-0.06)+2.6X^(-0.82)
    9=x^2+(3.5-x)^2
    0.01=8.2X^-0.06+2.6X^-0.82
    9=x^2
    x:（5.4－x）＝5:4
    2x^2-220x+628=0
    x:（5.4-x）=5:4
    (2x^3)*10=0.125*(1-x)^2
    -154.2ln(x)+1298.1 = 0.2281ln(x)+4.9444
    s^2+8s+8=0
    -3x^(2)+6x＋9=0
    -154.2ln(x) + 1298.1=0.2281ln(x) + 4.9444
    3(x+x^2+x^3+x^4+x^5+x^6+x^7)=100
    x+x^2+x^3+x^4+x^5+x^6+x^7=33.3
    34.3x-x^8=33.3
    (340*2040*2*x)/(340^2-x^2)=3
    x+8≥4x+1
    2x×x-5x-3＝0
    （x^2+3X+3)(1+x)^8=3.811
    4x（x+1）＝3+3x

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