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    (31500/(1+x))+(38500/(1+x)^(2))+(35000/(1+x)^(3))+(28000/(1+x)^(4)) = 90000
    (2x+3)(x-6)=16
    (31500/(1+x))+(38500/(1+x)^(2))+(35000/(1+x)^(3))+(28000/(1+x)^(4))=90000
    -10(x-30)(x-30)+4000=3000
    -10(x-30)(x-30)+4000
    ((31500/(1+x))+(38500/(1+x)^(2))+(35000/(1+x)^(3))+(28000/(1+x)^(4)))=90000
    0.04x^6+11.24x^4+256x^2=3020.8
    2447.9=14300×0.9×x×(1.165-0.5x)
    (x-10)*(-10x+500)
    1/x=e2
    95=6/(1+x)+6/(1+x)^2+6/(1+x)^3+100/(1+x)^3
    0.4^2.5
    1954.19=14300×0.9×x×(1.165-0.5x)
    38.32*((1-1/(1+0.95%)^360)/0.95%)
    38.32*((1-1/(1+0.95%)^360/0.95%))
    x^2+36249.34‬x-20168384.5911=0
    x=3.3*10^(-3)*(1-(300*x/2.613))^(2)
    x=3.3*10^(-3)*(1-(300*x/2.163))^(2)
    90πx/180=(6-x)π
    1/5x-2<4-2/5x

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