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ngocbichvu
2 năm trước
Tính a) (3 giờ 40 phút + 2 giờ 25 phút) x 3 b) 3 giờ 40 phút + 2 giờ 25 phút x 3 c) (5 phút 35 giây + 6 phút 21 giây) : 4 d) 12 phút 3 giây x 2 + 4 phút 12 giây : 4
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