(1080/1.08)/1000
    (120/1.09+(2*1080)/〖1.09〗^2 )/980
    (100/0.1+(2*100)/〖0.1〗^2 +(3*1100)/〖0.1〗^3 )/1000
    (1080/0.08)/1000
    32 2 2
    x^2-60x+600 = 0
    Arctan2sqrt(5)
    2X-2=25-X
    52.61*(1+18%)*(1+18%)*(1+18%)＝
    52.61*(1+20%)*(1+20%)*(1+20%)＝
    100^0.3
    2^-3
    100^-2
    128（1+x)2=608
    （54000x-5.7967）= 3.8-5.7967x
    （54000x-5.7967）= 54000-5.7967x
    54000-5.7967x=
    54000x-x5.7967 =
    54000x-5.7967x =
    54000-5.7967x =

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