1. Đặt tính rồi tính: a, 7 giờ 18 phút + 9 giờ 53 phút b, 48 phút 46 giây - 38 phút 59 giây c, 45 giờ 37 phút : 7 d, 26 phút 40 giây x 8 Các bạn viết ra giấy rồi chụp cho mình.

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