Hòa tan 6,2 gam natri oxit vào 150 gam nước thu được dd A. a. Tính nồng độ phần trăm của các chât trong A? b. Dung dịch A hòa tan được bao nhiêu gam Al2O3 để thu được dung dịch B? Tính nồng độ phần trăm của các chât trong dung dịch B?

EX12: Chọn đáp án đúng 1: ......... their work, they went home. A. Finishing B. Having finished C. Had finished D. Had finished 2: The girl..... behind you is naughty. A. stands B. stood C. is standing D. standing 3: ........ their farm work, the farmers returned home. A. Finishing B. Finish C. Having finished D. Being finished 4: ......... by the visitor, the clavichord could not be used. A. Broken B. Break C. Breaking D. Broke 5: After ......... dinner, I watch television A. eat B. eating C. eaten D. ate 6: When ......... in international trade, letters of credit are convenient. A. used B. are used C. using D. they used 7: She swam to the shore ......... the night in the water. A. having spent B. having spending C. when spending D. had spent 8: I believe here is somebody ......... on the door. A. to knock B. knock C. knocked D. knocking 9: The lady .........in blue is her aunt. A. dressed B. dressing C. is dressing D. in dress 10: .........from what you say, you are innocent. A. To judge B. Judging C. Judge D. To be judged 11: .........you to the job, he felt calm. A. Appointed B. Appoint C. Having appointed D. To appoint 12: .........so much, the doll is still on the shelf. A. Cost B. Costs C. To cost D. Costing 13: .........at by everyone, he was disappointed. A. Laughed B. Laugh C. Laughing D. In laugh 14: ......... anxious to please us, they told us all we wanted to know. A. Be B. To be C. Being D. In being 15: ......... the room, the man was no longer there. A. Entering B. When we entered C. On entering D. Having entered 16: Since ......... his new business, Bob has been working 16 hours a day. A. open B. opening C. opened D. 17: I really like horror films but my sister doesn't. She thinks they are very......... and ......... . A. frightened / bores B. frightening / bored C. frightened / boring D. frightening / boring 18: I didn't think you were .........in photography. A. interested B. interesting C. interesting D. interests 19: The recent oil spill along the Belgian coast resulted in ........consequences for the industry. A. worried B. worrying C. worries D. worrier 20: Our Design Department has recently purchased the most ......... software available, with the aim of greatly increasing our design capabilities. A. sophisticate B. sophisticating C. sophisticated D. sophistication 21: The plane began to move in a rather ......... way. A. alarming B. alarmed C. alarmingly D. alarm 22: I'm sorry, I can't come tonight. I'm completely ......... . A. exhausted B. exhaust C. exhaustedly D. exhausting 23: You look .......... Do you have any problem? A. worried B. worrying C. worries D. worrier 24: I can't eat this. It's ......... . A. disgusting B. disgusted C. disgustingly D. disgust 25: We saw many ......... places during our holiday. A. interested B. interesting C. interest D. interests 26: She doesn't like flying. She's ......... . A. frightening B. frightened C. frighten D. frightfully 27: It was very ......... for Tom when he was caught travelling without ticket. A. embarrassing B. embarrassed C. embarrassing D. embarrassment 28: He was very ......... with the results of his exam. A. disappointingly B. disappointed C. disappointing D. disappointment 29: I think I could do with a ......... holiday. A. relaxing B. relaxing C. relax D. relaxation 30: It was such a ......... story everybody ended up crying. A. moving B. moved C. movement D. move

Cho tam giác ABC vuông tại A có góc ABC = 60 độ. Kẻ tia Ax song song với BC, trên tia Ax lấy D sao cho AD = DC. a) Tính góc BAD và góc DCA. b) Chứng minh tứ giác ABCD là hình thang cân. c) Gọi E là trung điểm của BC. Chứng minh tứ giác ADEB là hình thoi. d) Cho AC = 8 cm, AB = 5 cm. Tính diện tích hình thoi ABED giúp với ạ:(

Ở bí tính trạng quả ngọt trội hoàn toàn so với tính trạng quả chua. a. Giao phần giữa 2 cây P đều có quả ngọt thu được các cây F1 , trong số đó có cây có quả ngọt và có cây có quả chua.Hãy biện luận để tìm kiểu gen của cây P và lập sơ đồ lại. b. Tiếp tục cho các cây F1 thu được trong phép lai trên tự thụ phấn. Hãy lập các sơ đồ tự thụ phấn có thể xảy ra. Mn ơi giúp em bài này vs hứ vole 5 sao. Cám ơn nhiều ạ

Đến đây giải bc tiếp theo sao vậy anh chị

trả lời các câu hỏi sau: 1.The name of IOE event to start the new academic year 2️⃣. The month when all pupils are back to school after summer holiday 3️⃣. The place where pupils come to read books at school 4️⃣. The time when you can play after finishing your homework 5️⃣. A response to a question 6️⃣. A subject to learn about numbers and calculations 7️⃣. The same clothes all pupils of a school have to wear when going to school (often on Mondays) 8️⃣. The place where pupils play outside at school at break time 9️⃣. A subject to learn about events in the past

Mọi người giúp mình với mình đang cần gấp

Giúp mik 2 ý rút gọn này với 🥺

$\text{Hình bên dưới có $\widehat A=\widehat{AEC}=\widehat{ADB}$.}\\\text{Tính $\widehat{A}$ biết $\widehat{BFC}=105^\circ$.}$

Giúp mình câu a,b với ạ Hứa 5* ạ