(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)
    7+36/6
    5*9-41
    81-5*2
    61-9*3
    9*4/6
    25/5*8
    60-12/6
    6*7+3
    7+6*4
    7/7*3
    28/4*6

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