A十A十A＝12
    12000=5000/0.13【1-1/（1.13）^n】
    (77/1.64)*(0.5-（X^2)/(2*120^2)+ln(X/62.13)+(260/1339)*(0.4*ln(X/62.13)+0.3+(X^2/(2*69.85^2))))=0
    a十a十a=12
    （1÷4）∧（5÷3）×4.4601＝k
    40= 0.0055x + 7.072
    41= 0.0055x + 7.072
    13= 0.0055x + 7.072
    y = 0.005513 + 7.072
    2/x+5(1/x +1/(x-4)=1
    y= 5.4778e0.0008129
    y= 5.4778e0.0008121
    y= 5.4778e0.0008125
    x^(2)-30.0137x-132.612＝0
    y= 5.4778e0.000812
    y= 5.4778e0.0008116
    y= 5.4778e0.00081
    y= 5.4778e0.00086
    6= 5.4778e0.0008x
    25= 5.4778e0.0008x

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