HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
1. Last week, my mother (take) ___________ me to the zoo. 2. When we (arrive) ___________ at the party, there (not be) ___________ many people there. 3. My mother (say) ___________ that she (buy) ___________ me a new dress. 4. Last summer, my father (teach) ___________ me to drive. 5. I (start) ___________ doing charity when I (be) ___________ a first year student. 6. Many rich people (donate) ___________ money for this volunteer program. 7. My friend (ring) ___________ me yesterday and (invite) ___________ me to his party. 8. What (you/ watch) ___________ on TV last night? 9. When my father (be) ___________ young, he (use to) ___________ be the most handsome boy in the village. 10. ___________ (you/ go) to see the concert yesterday? 11. My performance (not be) ___________ really good. I (not feel) ___________ happy about it. 12. Jim (spend) ___________ the whole day taking after his brother. 13. I (write) ___________ a letter to my foreign friend but he (not write) ___________ back. 14. ___________ (they/ be) students of our school? 15. Yesterday, I (see) ___________ Jim at a bookstore.
làm hộ em bài 1.39
đề bài là j
Bài 1. Cho tam giác ABC có góc B<90 độ. Trên nửa mặt phẳng bờ BC có chứa A, vẽ tia Bx vuông góc với BC, trên tia đó lấy D sao cho BD=BC. Trên nửa mặt phẳng bờ AB có chứa C, vẽ tia By vuông góc với BA, trên tia đó lấy E sao cho BE=BA. Chứng minh rằng
Chứng minh rằng
a) DA=EC
b)DA vuông góc với EC