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- Luyện tập (trang 89)
- Luyện tập chung (trang 90)
- Các số có bốn chữ số (trang 91, 92, 93)
- Luyện tập (trang 94)
- Các số có bốn chữ số (tiếp theo) trang 95
CÁC BÀI TRƯỚC
- Luyện tập (trang 82)
- Luyện tập chung (trang 83)
- Hình chữ nhật (trang 84, 85)
- Hình vuông (trang 85, 86)
- Chu vi hình chữ nhật (trang 87)
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