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xuantung66666666
2 năm trước
Một mảnh đất hình tam giác có độ dài đáy là 40m . Chiều cao có độ dài bằng 2/5 đáy A, tính diện tích mảnh đất đó B, người ta mở rộng đấy mảnh đất dài thêm một đoạn nữa thì diện tích mảnh đất tăng thêm 40m² . Tính độ dài phần đấy được mở rộng. C, tính tỉ số phần trăm diện tích đất tăng thêm và diện tích đất trước khi chưa mở rộng
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