Trả lời:
8 ngày 13 giờ + 7 ngày 19 giờ = 16 ngày 11 giờ
Hok tốt
16 NGÀY 11GIOWF
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16 ngày 11 giờ
8 ngày 13 giờ + 7 ngày 19 giờ = 16 ngày 8 giờ
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