Mathematics
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    1+(39763/30+3822+3734)/{0.9[8190/60+3200/60*5]}
    (39763/30+3822+3734)/{0.9[8190+3200*5]}
    212-7920/63+200
    arctan√10
    arctan(√10)
    arccos(-0.75)
    √((47.85/280)^2+(47.85/160)^2 )
    (240.5×10^3)/(1×π×80^2/4)
    (240.5×0.15×10^6)/(15×(π×80^3)/32)
    arctan(1/9.8)
    √((51.04/280)^2+(47.85/160)^2 )
    (240.5×0.16×10^6)/(15×(π×80^3)/32)
    (240.5×10^3)/(1×π×80^2/4)
    4746700/(1.05×237000)
    0.4∧0.9
    0.4∧0.8
    4*(16-9)
    (11-8)*8
    (11-8)*8
    50-(30+10)

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