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2 năm trước
Lấy điểm O thuộc đường thẳng xy điểm a thuộc Ox điểm b thuộc Oy sao cho oa = OB chứng tỏ O là trung điểm của đoạn AB
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A horse on board the Enterprise was perhaps the first and only horse ever to save the lives of its shipmates. The Enterprise was sailing for North Carolina. She carried a mixed cargo, and there were fifteen passengers on her. She was making good timed until at dawn, she struck something. Water poured into the ship. The holds were soon flooded. Frightened men and women climbed the rigging to save their lives. The crew tried to pump the holds out, but with no luck. Then the cargo caught fire. All those on board thought they would die. The captain knew the coast was near. But how near? Perhaps if the horse could reach land, the people could, too. The horse was led to the side and pushed over. The horse did reach land. In fact, it almost waded ashore! The people soon followed. All were saved, thanks to a nameless horse. 1. There were .......................... people on the Enterprise. 2. The ship was wrecked at .......................... 3. When water poured in, the crew tried to .......................... the holds. 4. The horse was pushed overboard in the hope that it could .......................... 5. The horse got ashore almost by ..........................

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