954*（1+X）^3=990
    25950/(1+x)^0.5+25950/(1+x)^（7/12）+25950/(1+x)^（8/12）+25950/(1+x)^（9/12）+25950/(1+x)^（10/12）+25950/(1+x)^（11/12）+25950/(1+x)^（12/12）=50000
    25950/(1+x)^0.5+25950/(1+x)^0.6+25950/(1+x)^0.7+25950/(1+x)^0.8+25950/(1+x)^0.9+25950/(1+x)^1+25950/(1+x)^1=50000
    101.6/(1+X/12*12)=79.8
    25950/(1+x/12*6)+25950/(1+x/12*7)+25950/(1+x/12*8)+25950/(1+x/12*9)+25950/(1+x/12*10)+25950/(1+x/12*11)+25950/(1+x/12*12)=50000
    80000+450X=130000+400X
    (x-18000)÷x=0.6
    7115*X=142.3
    （68800/x）*1000=1
    （68800/x）*1000=1
    68800/x*1000=1
    68800/x*1000=1
    X×3.15＝149.331-x
    X×3.15＝149.331-x
    X×2.95＝149.331-x
    X×2.75＝149.331-x
    X×2.55＝149.331-x
    X×2.35＝149.331-x
    X×2.15＝149.331-x
    3a²➗a²＝

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