cho tam giác ABC nhọn.H là trực tâm của tam giác ABC;AD là đường cao. Biết HA=7cm;HB=√5cm;HC=√17cm. a)Tính AD b)Tính Sabc

Cho hai số tự nhiên a và b (a < b). Tìm tổng các phân số tối giản có mẫu bằng 7, mỗi phân số lớn hơn a nhưng nhỏ hơn b.

I/ Complete using a word formed from the letters given. 1. Ben couldn’t play football for 2 months because of an ..... . ( R U N J Y I ) 2. Becky always looks really .... . She must get lots of exercise. ( L A Y E T H H ) 3. What’s the best .... for a bee sting? ( T E N T R A T E M ) 4. Have doctor finally found a .... for malaria ( U R E C ) II/ Write one word in each gap 1. If you work in an office, you spend most of the day sitting ..... 2. If you’re a teacher, you spend a lot of your time standing ..... 3. I fell .... on the way home from school and hurt my knee 4. My dad has put ... two kilos since he gave up smoking. 5. Do you think I should cut .... on how much sugar I have in tea and coffee ? 6. I’ve got a headache so I’m going to lie ..... 7. My mum has had flu but she’s getting ... it now. 8. This chicken smells awful. It must have gone ..... III/ Complete by changing the form of the word in capitals when this is necessary 1. I’ve never had a serious .... problem, thank goodness! MEDICINE 2. Toby is thinking of taking up ... . JOG 3. My mum works in a .... so she brings home loads of lovely cakes. BAKE 4. We used to have an electric cooking but now we’ve got a gas one. COOK 5. It’s not very .... to eat such a large meal just before going to bed. SENCE 6. This spoon is .... . I’ll get another one. BEND 7. You look thinner. Have you lost .... ? WEIGH 8. It’s not Karen’s ... to give up eating meat completely. She just wants to eat is less often INTEND 9. Over the last ten years, there’s been a ... in the number of children being born in this country. REDUCE 10. I fell over and my knee is still a bit ... but it’s slowly getting better. PAIN 11. Harry is quite ... so be careful what you say about his new better. SENSE 12. I’ve just bought a new ... book. It’s got some great recipes in it. COOK 13. The injection is quite .... You won’t even feel the needle going in. PAIN

Vẽ cây nấm và cây xương rồng hộ mk nha

Rewrite the following sentences, using a past participial 1 The ideal which are presented in that book are interesting 2 I come from a city that is located in the southern part of the country 3 they live in a house that was built in 1890 4 The photographs which were published in the newspaper were extraordinary 5 The experiment which was conducted at the University of Chicago was successful

vẽ cho mình một chú hêu cute cầm một cái bật lửa đứng trcs một chiếc xe đang mở bình xăng còn ảnh sau thì vẽ một con lợn quay nằm giữa đường cùng vs cái bật lửa bị vỡ nhé, cám ơn mn

Giải 3 bài này giúp mình với ak.

hỗn hợp X gồm co2,so2,no có tỉ lệ % về thể tích lần lượt là 20%,30%,50%.Hãy tính tể lệ % về khối lượng của mỗi ntố trên

trên tuyến đường sắt Thống Nhất, quãng đường từ Hà Nội đến Đà Nẵng dài 791km, quãng đường từ Đằ Nẵng đến TPHCM dài hơn quãng đường đó 144km. Hỏi b) Đường sắt từ Hà Nội đến TPHCM dài bao nhiêu ki-lô-mét ?

Cho mk xin hỏi các bạn có bạn nào biết cách vào học liệu điện tử của cánh diều không? Nếu có ai biết thì cho mk biết cụ thể với! Mong mod không xóa!!!!!!