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Ngày cập nhật gần nhất: 15/4/2026
Guidelines for solving Exercise 1 on Pages 4 and 5 of Math 4 Textbook
Problem statement:'
Mental Calculation:
7000 + 2000 16000 : 2
9000 - 3000 8000 x 3
8000 : 2 11000 x 3
3000 x 2 49000 : 7
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