3 cos x + 5 = 0 giai giup vs a

Cho 1-2ml dd H2SO4 loãng vào ống nghiệm chứa ít Fe(OH)3.Nêu hiện tượng

Giúp mìn với mình đang cần gấp :(((

Câu 5. Cho tứ giác ABCD có các tia phân giác của các góc A và D vuông góc với nhau tại E. a) Tứ giác ABCD là hình gì? Chứng minh. b) Các tia phân giác của các góc B và C cắt nhau tại F. Gọi M, N lần lượt là trung điểm của AD, BC. Chứng minh ME và FN song song AB.

mọi người ơi giúp mình câu này với :(( Đem lai 2 cây thuần chủng hạt lục và hạt vàng, thu được F1 100% cây hạt lục. Ta có thể kết luận điều gì ở câu nói trên

Ai biết môn nào thì làm câu đấy ạ ! Mong mn giúp mình

Ai giỏi giupa tớ nhé làm đúng vs ạ😭😭

Maths Problems There are 4 doctors working in a clinic. Each doctor has 2 nurses assisting them. There are two receptionists, Jay, and Molly, working at the reception. 1. How many people are working in the clinic? 2. On Monday, 23 patients made appointments with each doctor. However, 6 of the patients did not show up. How many patients visited the clinic on Monday? 3. On Tuesday, Jay answered 45 phone calls and Molly answered 12 more calls than Jay did. How many calls were answered in total? 4. On Wednesday, a doctor called in sick. The two nurses and Jay together called 36 patients to reschedule their appointments. They shared the calls evenly. How many calls did they each make? 5. Among the calls they made, 13 of the patients decided to cancel their appointments and the rest decided to postpone their appointments. How many appointments were postponed?

Câu 4. Cho hình thang ABCD (AB//CD) có góc ACD = góc BDC.Chứng minh rằng: BD ²-BC ²=AB.CD

IV. Read and circle the sentence True or False A YOUNG VOLUNTEER'S STORY. It has been a pleasure to do volunteer work as my hobby. Also, I find it easy to do. I decided to work with patients at home. They need to live normally again. They feel lonely and want to have a chat with someone. They also want to go out with someone, perhaps to do some shopping or just to get some fresh air It's been great meeting new people in this way. However, it can be difficult to say goodbye to them when it all comes to an end. I am glad to do voluntary work in this way; and there is something for everyone. I think more people of all ages should do voluntary work if they have free time. Younger people will find volunteering satisfying and fun. 1. ____________ Voluntary work is the writer's hobby. 2. ____________ He volunteered to look after patients in hospital. 3. ___________ Patients at home feel lonely because no one talks to them. 4. ___________ He finds voluntary work unpleasant. 5. ____________ They want to go out with someone to enjoy fresh air. 6. ____________ They don't want to go anywhere. 7. ____________ He thinks young and old people should do voluntary work. 8. ____________ The writer can't meet new people when he works with patients at home