



CÁC BÀI TIẾP THEO
- Chu vi hình chữ nhật (trang 87)
- Chu vi hình vuông (trang 88)
- Luyện tập (trang 89)
- Luyện tập chung (trang 90)
- Các số có bốn chữ số (trang 91, 92, 93)
CÁC BÀI TRƯỚC
- Luyện tập (trang 81)
- Tính giá trị của biểu thức (tiếp theo) (trang 81, 82)
- Luyện tập (trang 82)
- Luyện tập chung (trang 83)
- Hình chữ nhật (trang 84, 85)
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