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nghiaphan
2 năm trước
Câu 10 a) Người ta mở rộng một cái hồ hình vuông về bốn phía mỗi phía 5m. Sau khi mở rộng diện tích hồ tăng thêm 380m2. Tính diện tích hồ khi chưa mở rộng.   b) Một thửa ruộng hình tam giác có diện tích 694, 4m2 . Nếu mở rộng đáy thửa ruộng thêm 4m thì diện tích thửa ruộng tăng thêm 49,6 m2 . Tính đáy của thửa ruộng.
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