Mathematics
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    (-7/5)/((-0.4)^2)+(-1)*((-5/2)^2)
    1+(15*12)
    150000*6.2-150000*6.2*(1-0.0006)^6000
    150000*6.2-150000*6.2*(1-0.0006)^600
    900000-900000*(1-0.0006)^600
    900000-900000*(1-0.0006)^300
    620000-620000*(1-0.0006)^900
    620000-620000*(1-0.0006)^600
    620000*(1-0.0006)^600
    620000*(1-0.06)^300
    620000*(1-0.06)^600
    lg3.77
    1.59*20
    20lg10^1.59
    20lg1.59
    arctan(0.05*1.59)+arctan(0.25*1.59)+arctan(0.1*1.59)=
    (13.7-12.3)/12.3
    (12.89-12.3)/12.3
    432-278
    89+52

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