X-550-(1000*6%/12+1500*8%/12+x*6%/12)=50
    5X-6×X/3=27
    1.5＝2arctan（0.2/x）
    1.5＝2arctan（0.2/x）
    6+x-x²
    y^2-(26887/990)y+1980=0 x^-4=0
    y^2-(26887/990)y+1980=0
    y^2-26887y/990+1980=0
    y²-26887y/990+1980=0
    x^2*㏑(0.0072*0.9/0.0078/x）/(1-x)^2/㏑(7.2/9.6/(1-x))=1
    1/5（x-9）=1/2x-9
    1.13*29846.02 =x*365*11
    （x^2*ln（6.58*0.9/（0.7x）））/（（1-x）^2*ln（6.58*0.1/（8.8*（1-x））））=1
    1.13*311199.12 =x*365*100
    x（x+2）＝50
    X-550-(100*6%/12+1500*8%/12+x*6%/12)=50
    2x^3+8x^2-x-9=0
    1/2*6.75*(4/3)^2=x
    t=4/3-(4*sqrt(6))/9
    0.5*6.75*x^2=4

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