(1+X)^7×(1+0.17%)^12×(1+0.11%)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+0.16%)^12×(1+0.11%)^12×(1+0.25%)^12=1.074
    (1+X)^7×(1+0.17%)^12×(1+0.11%)^12×(1+0.25%)^12=1.074
    122.629+7.18=7.18*(1-r^11)/(1-r)
    335.97+15.5=15.5*(1-r^11)/(1-r)
    √3x＝27.3-x
    x+x*20%=4767
    (x*12%)+x=19000
    Xx0.7=227880
    （x*0.12）+x=19000
    4*x*x*x*x+108*x*x-972=0
    x^7-17*x^6+108*x^5-(38*9-6)*x^4+(68*9-64)*x^3-(58*9-62)*x^2+(22*9-15)*x-3*9=0
    x^7-17*x^6+108*x^5-41*x^4+(68*9-64)*x^3-(58*9-62)*x^2+(22*9-15)*x-3*9=0
    （15234.375－S）×0.4033/1.06＝12187.5－S
    S－S*0.4033/1.06＝1662.62
    90x-9=88x-1
    90x-9=88+1
    n^3-6n^2+8n=0
    x^4-(8+5) x^3+(6*8+3) x^2-(9*8-5) x+3*8 = 0
    x^4-(6+5) x^3+(6*6+3) x^2-(9*6-5) x+3*6 = 0

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