Một hình hộp chữ nhật có chiều dài 24cm, chiều rộng bằng 3/8 chiều dài. Thể tích hình hộp chữ nhật 3240cm ³. Tính chiều cao của hình hộp đó

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Change active into passive: 1. Mary types letters in the office. ………………………………………………………………………………………………… 2. His father will help you tomorrow. ………………………………………………………………………………………………… 3. Science and technology have changed human life. ………………………………………………………………………………………………… 4. Peter broke this bottle yesterday. ………………………………………………………………………………………………… 5. They can’t make tea with cold water. ………………………………………………………………………………………………… 6. Mary is cutting a cake with a sharp knife. ………………………………………………………………………………………………… 7. People speak English in almost every corner of the world. ………………………………………………………………………………………………… 8. You mustn’t use this machine after 5:30 p.m. ………………………………………………………………………………………………… 9. After class, the students always erases the chalk board. …………………………………………………………………………………………… 10. They are watering the flowers. ………………………………………………………………………………………………