（x-1160）÷1700=（x-1400）÷1200
    （x-1100）/2200=（x-1160）/1700
    2^x=x+3
    2^x=x+3
    1598.5+1598.5*0.05+0.05*X+(1598.5+1598.5*0.05+0.05*X)*0.0475*2/2+(1598.5+1598.5*0.05+0.05*X+(1598.5+1598.5*0.05+0.05*X)*0.0475*2/2)*0.31+0.0524*X=x
    1598.5+1598.5*0.05+0.05*X+(1598.5+1598.5*0.05+0.05*X)*0.0475*2/2+(1598.5+1598.5*0.05+0.05*X+(1598.5+1598.5*0.05+0.05*X)*0.0475*2/2)*0.3+0.0524*X=x
    1460.5+1460.5*0.05+0.05*X+(1460.5+1460.5*0.05+0.03*X)*0.0475*2/2+(1460.5+1460.5*0.05+0.05*X+(1460.5+1460.5*0.05+0.03*X)*0.0475*2/2)*0.3+0.0524*X=x
    x^5-4x+4
    x^5-4x+4
    x/8000+(40000-x)/500=50
    x/8000+(40000-x)/500=50
    （1+x/4）^4-1 = 0.1025
    （1+x/4）^4-1 = 0.1025
    (1+x/4)^4-1=0.1025
    (x-3)/x＾2
    13+(x*1.02+2.5)+0.15*x+(13*0.1655)=164
    0.10*x+(x*1.05+200)+0.15*x+(0.10*x*0.1788)=164
    0.10*x+(x*1.05+150)+0.15*x+(0.10*x*0.1655)=6409.99
    15+(x*1.08+2.5)+0.15*x+(15*0.1655)=140.76
    15+(x*1.08+2.5)+0.15*x+(15*0.1655)=106

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