0=31.653*e^(-x/4.05)+31.653*e^(-x/11.897)-0.0581
    sqrt(2sqrt(5)-2)/sqrt(2sqrt(5)+2)
    2729160048＋(-243918858)＝
    sqrt(25-(5sqrt(5)-5)^2/4)
    5x-2(x-3)=15
    10+3x-X=40
    2X+8=5
    2X=5
    lnx=5
    (1+g)/g=7.8
    x^2-31x+220=2^x(31-2x-2^x)
    ((2.3/2)^(0.3/1.3))*0.397
    1.23/Y*100％＝3.3
    100=a^2×(1+a^2)×(1+0.01a^2)
    n*（n-1)*(n+1) = 504
    （2150-15y）+15y=2150
    （x-1044.85）/x=0.3％
    2+((0.589*(3.824*10^10)^0.25)/(1+(0.469/0.7228)^(7/16))^(4/9))
    5x-0.1x=7.6
    1600=0.2x+400

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