Bài 6: Hòa tan 25g hỗn hợp A gồm canxi cacbonat và bạc clorua vào 150g dd HCI vừa đủ thị thu được ddB, kết tủa ;v dot a 1,972 lit kh (ở Jkc) . a) Xác định thành phần % về khối lượng các chất có trong hỗn hợp A b) Tim khối lượng kết tủa C. c) Xác định khối lượng dd HC1 đã dùng. d) Tính nồng d6\% ddB. 11

mn ơi giúp em với ạ.............!

There was long applause because she sang. (Beautiful)

Cho a + b =1. Hãy tính giá trị của biểu thức 𝑁 = a ^3 + b ^3+ 3ab giúp cái nha :)

Help!! Giúp mik với!! #HuyenTrang

nêu ách tính chu vi hình thoi nêu cách tính chu vi hình tròn nêu cách tính diện tích hình tròn

ở sinh vật đơn vị quần xã dùng để chỉ tập hợp

cho tam giác abc vuông tại a biết ab phần ac bằng 5 phần 7 đường cao ah bằng 15cm tính hb hc

A. Rearrange the sentences to make meaningful sentences 7. always / The / six forty-five / arrives / school bus / at /. → 8. always/ at nine o’clock/ out of the garage/ in the morning/ drives/ his car/ he. → 9. a parking place/ near the shops/ they/ find/ rarely. → 10. you / Sunday / What time / usually / do / on / get up /? → 11. speak / We / our / in / Vietnamese / English class / hardly ever /. → 12. mother/ On/ the/ my/ always/ washing/ does/ Mondays. → 13. out/ once/ put/ I/ dustbins/ week/ the/ a. → 14. a/ go/ with/ often/ walk/ dog/ for/ We/ our/ → 15. sister/ ironing/ sometimes/ My/ the/ does. → B. Complete the second sentence so that it has the same meaning as the first. 1. My father usually drives to work. → My father 2. This house is small. → It 3. The bookstore is to the right of the toy store. → The toy store 4. Is there a computer room at your school? → Does ? 5. What is your favorite subject? → What ? 6. There are 35 students in my class. → My class 7. Ba has a sister, Lan. → Ba 8. Nam rides his bike to school everyday. → Nam 9. Mai live near her school. → Mai’s house 10. Mary plays the piano very well. → Mary 11. Does Phong’s school have forty classrooms? → Are ? 12. Do you like physics? → Are ? 13. The school has a computer room and a library. → There 14. Phuong has a brother, Nam. → Phuong 15. Both Maths and English are interesting to him. → He is 16. Hoa’s school has more than 500 students. → There more 17. When does the music class start ? → What ? 18. This boy is strong. → He 19. Are there four people in your family? → Does ? 20. What time does she go to work? → When ?

giải các phương trình lượng giác sau: sin2x = cosx