（310*x*x-1.107*2*x）*3.1415926/4=0.06
    （310*x*x-1.107*2*x）*3.1415/4=0.06
    (1+X)^7×(1+X-0.0012)^12×(1+X-0.0008)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.0018)^12×(1+X-0.0016)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.0022)^12×(1+X-0.0016)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X)^12×(1+X)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.09)^12×(1+X-0.15)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.2)^12×(1+X-0.5)^12×(1+0.25%)^12=1.1349
    (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

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