Mathematics
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    3843.96 × 0.5% =
    168.96 + 3675
    168.96 + 3675 + 244.4
    23.5×365 + 168.96 + 3675 + 244.4 =
    23.5 + 168.96 + 3675 + 244.4
    5*1268
    200.646 + 244.4 + 20.53 + 846=
    4106.86 × 0.5%
    18.5 + 168.96 + 3675 + 244.4 =
    16.896 + 183.75 =
    2400 + 775 + 500
     1570.5 - 392.625
    1570.5 × 25%
    arctan(3.27/16.77)
    arctan(5/4)
    arctan5/4
    (4+1.1+11+10+1.8+10+2.2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22) × 7
    10/(0.8*sqrt(1+(0.64/80)^2)*sqrt(1+(0.64/61)^2))
    (1.9×10^3-0.3×1448.2×10^3)/(0.9×0.44×300)
    0.4×1448.2×0.883

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