4+4*(1/3*a^2-a)>0
    0.005=0.00443X^(-0.095)+0.26X^(-0.47)
    0.005=0.00443X^-0.095+0.26X^-0.47
    x^2-3*x+3=0
    (110/12)*x^3+110x*(55-x)^2+[x(110-2x)^3]/12=1287400
    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

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