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1:12 × (3 - 13 ÷ 13) 2:12 × (3 - (13 ÷ 13)) 3:(3 - 13 ÷ 13) × 12 4:(3 - (13 ÷ 13)) × 12 你下次還要算的話 別忘了給我加點分啊
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