1/(1+0.0350)^4
    1000/(1+0.042)^2
    y=10/1+e^(0.05*200-5)
    1+e^2
    6/2（1+2）
    2x^2+98 = (16-2x)^2
    0.96x-200＝x-440
    0.96x-200＝x-400
    0=207.243*e^(-x/5.93)+0.49661
    0=63.30581*e^(-x/7.5232)-0.00581
    0=97.623*e^(-x/5.93)+109.626*e^(-x/5.93)+0.497
    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

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