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20 tháng 3 2019
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NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
17 tháng 6 2023
Thời gian từ giữa nửa đêm đến giờ cũng chính là thời gian bây giờ
2 lần thời gian từ bây giờ đến giữa trưa cùng ngày bằng:
1 - \(\dfrac{1}{7}\) = \(\dfrac{6}{7}\) (thời gian bây giờ)
Tỉ số thời gian từ bây giờ đến giữa trưa cùng ngày và thời gian bây giờ là:
\(\dfrac{6}{7}\) : 2 = \(\dfrac{3}{7}\)
Tổng thời gian bây giờ với thời gian từ bây giờ đến giữa trưa cùng ngày là:
24: 2 = 12 (giờ)
Ta có sơ đồ:
Theo sơ đồ ta có:
Thời gian bây giờ là: 12: (3+7)\(\times\) = 8,4 (giờ)
Đổi 8,4 giờ = 8 giờ 24 phút
Đáp số : 8 giờ 24 phút
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
17 tháng 6 2023
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