user-avatar
thainguyenok0351
2 năm trước
Câu 3: Cho tam giác ABC cân tại A . Vẽ AH vuông góc với BC tại H. a) Chứng minh: ΔAHC = ΔAHB. b) Kẻ HM vuông góc với AC tại M. Trên tia đối của tia HM lấy điểm N sao cho HN = HM. Chứng minh ΔHMC = ΔHNB, từ đó suy ra số đo góc HNB. Mọi người giúp mik vs ạ ,cám ơn trc ạ.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

IV. Read and answer these following questions. HOW CAN WE KEEP OUR TEETH HEALTHY Firstly, we ought to visit our dentist twice a year. He can fill the small holes in our teeth before they destroy the teeth. He can examine our teeth to check that they are growing in the right way. Unfortunately, many people wait until they have toothache before they see a dentist. Secondly, we should brush our teeth with a toothbrush and fluoride tooth paste at least twice a day – once after breakfast and once before we go to bed. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly, we should eat food that is good for our teeth and our body such as milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables, and fresh fruit. Chocolate, sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful because they stick to our teeth and cause decay. 15. How often should we visit our dentist a year? _______________________________________________________________ 16. What should we brush our teeth with? _______________________________________________________________ 17. What else we can use to clean between our teeth after a meal? _______________________________________________________________ 18. What kinds of food are good for our teeth? _______________________________________________________________ 19. What kinds of food are bad for our teeth? _______________________________________________________________ VI. Reorder the words to make the meaningful sentences 20. hard – working/ is/ but/ her/ is/ lazy/ ./ She/ very/ brother ____________________________________________________________ 21. does / always/My mother/the grocery shopping. ____________________________________________________________ 22. We/watch/often/TV/after dinner. ____________________________________________________________ 23. students / their/homework/usually/The/do. ____________________________________________________________ Giúp mình nha. Mình sắp phải nộp rùi!

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team