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- Tính giá trị của biểu thức (tiếp theo) (trang 80)
- Luyện tập (trang 81)
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- Luyện tập (trang 82)
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- Luyện tập (trang 76, 77)
- Luyện tập chung (trang 77, 78)
- Làm quen với biểu thức (trang 78)
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