Mathematics
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    π/2-arctan4.47
    7*2+10*4+13*6+16*8+64*40
    7*2
    (100/4100)*610=
    (350/4100)*610=
    (375/4100)*610
    (450/4100)*610
    (1000/4100)*610
    1000*( 1 - 0.1 )*( 1 - 0.03 )*( 1 - 0.05 )
    (700/4100)*610
    59*231*0.4
    2*521+272
    2*512+272
    300000+[8*7*(40*2+80)+7*12*(40*2*60%+80*70%)]*(4+3)+50*7*20*(10+3)-25000-54000+40000
    300000+[8*7*(40*2+80)+7*12*(40*2*60%+80*70%)]*(4+3)+50*8*20*(10+3)-25000-54000+40000
    300000+[8*7*(40*2+80)+8*12*(40*2*60%+80*70%)]*(4+3)+50*8*20*(10+3)-25000-54000+40000
    3.36/32
    4.2*10^4*5*16
    0.02*4.6*10^7*0.3
    1.86-1.86*30/31

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