The bed isn't clean enough............. A.to lie in it B.to lie in C.for lying in D.for lying in it

Cho tam giác ABC nhọn có góc A bằng 60, AB < AC, BC = 4cm. Vẽ các đường cao BD và CE. a) Chứng minh ADE ഗ ABC b) Tính độ dài ED c) Tính độ dài AH giải dùm mình câu c :)) cảm ơn

tinh chế : NaCl lẫn MgCl2 , FeCl3, CaCl2 , NaBr, NaI, NaHCO3 Mn viết PTHH ra dùm em với ạ

Giải phương trình chi tiết giúp mình nhé mình sẽ vote và cảm ơn

nhanh len nhe ngan gon het suc vao a

1. He (read) …………………… a book about American history at the moment. 2. Why ……………… you (laugh) ………………? What’s so funny? 3. I can’t help you now. I (work) …………………… 4. Oh no! It (rain) …………………… again. 5. ……….. you (watch) …………………… the TV or can I turn it off? 6. Bill (learn) ………………… to drive at the moment. His father (teach) …………… him. 7. Listen! The neighbors (have) …………………… an argument again. 8. Sally (wear) …………………… her new T-shirt today. 9. Robert! What ………… you (do) …………………… here? 10. I (not sleep) …………………… very well at the moment

Chứng minh rằng: a) 7 mũ 6+ 7 mũ 5– 7 mũ 4 chia hết cho 55 b) 16 mũ 5+ 2 mũ 15 chia hết cho 33 c) 81 mũ 7– 27 mũ 9– 9 mũ 13 chia hết cho 405

Lisa and her friends (1) …………………. studying for their final exams. They are very excited for this exam as it’ll be the last exam of the term. They are studying Maths right (2) …………………. Mary (3) …………………. helping the others. She is the top student in the class. She is really good at Maths. Emily is also good at Maths. She (4) …………………. studying Maths. She is (5) …………………. a book. They (6) …………………. talking loudly, because they are at the library at the (7) …………………. Sally is (8) …………………. the net for extra exercises. They are (9) …………………. to solve her exercises. They are all (10) …………………. each other to pass the class with high marks.

phân tích đa thức thành nhân tử: x^3-19x-30 Giải dễ hieur nhanh

viết calli (serena) hoặc(santoshi) nl:dạo này sao tui lại bị mê pokemon