x*ln(x/0.012)=0.068
    24＝50x+35x^2+10x^3+x^4
    x+x^2+3x^3＝2
    x+x^2+3x^3＝0
    4.7%*(1/(1+1))*(1-21%)+Re*(1/(1+1))=7.8%
    4.7%*(2/(1+2))*(1-21%)+R*(1/(1+2))=7.8%
    -0.4x+0.1（2500-x）=2480
    -0.4X+0.1（2500-X）=2480
    0.4x+0.1（2500-x）=2480
    x*ln(x/0.012)=0.08725
    4.7%*(1.25/(1+1.25))*(1-21%)+R*(1/(1+1.25))=7.8%
    4.7%*(1/(1+1.25))*(1-21%)+R*(1.25/(1+1.25))=7.8%
    7/6（26.25x^2+66x）=187.38
    x∧4-2x-4=0
    25-4P=-15+6P
    x（x+2.5）=4.3
    220＝237.4x-17.9x²
    x^3-11x-6=0
     Y = （100+0.8Y）+460
     Y = （100+0.8Y）+460

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