Mathematics
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    (395.9×1000×725134)/(193498783×2×12)
    (59.38×1000×1000)/787124
    (59.38×1000×1000)/1665651
    395.9×0.15
    arccos(0.9994)
    13-(-17)+(-8)-16
    13-(-17)+(-8)-16
    13-(-17)=
    13-(-17)=
    arctan(-1)
    arctan(-1)
    0.73×1/2×2^2×3.05
    0.82×2.5
    20+7+5+3+2.5+3+1
    251889.17*160*2800/543000/160
    251889.17*475*200/543000/200
    251889.17*475*200/145400/200
    (475×30+2800×18)
    86555.11*160*2800/145400/160
    86555.11*475*200/145400/200

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