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O 10: 24，o 10: 238，O 10: 25o，O 20: 00，O 20: 00: 00，O 20: 00: 00: 00，20: 00: 00？
① ○ + △ =24

② ○ + □ =38

③ △ + □ =50

② - ① :□ - △ = 14 ④

④ +③:□ = 32

③ : △ = 18

① : ○ = 6

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