a)phân hủy 12,25 g KCLO3 taọ ra 7,45 g KCL và O2. tính khối lượng O2 b)cho O2 trên tác dụng 16.8g Fe đc m(g)Fe3O4. tính m biết hiệu suất là 80%

tìm `x` nguyên để phân thức sau nguyên : `(x+2)/(x^2+4)` giúp mk với nhaaaaaa , mk sẽ vote đầy đủ + ctlhn

. Fill in each blank with ONE suitable word to complete the following sentence Boring-clothes-enjoy-never-hair-parties-late-think-unusual-at the moment Is this Robbie Williams? No, it isn't. This man looks like Robbie Williams but his name is Kevin Black. Kevin has an (1) ____________ job. He goes to the party every weekend. That's because he's a "celebrity lookalike". Our reporter, June Richardson, interviewed Kevin. June: What do you do in your job, Kevin? Kevin: I go to (2) ____________ and I dance and sing Robbie Williams songs. June: Do people (3) ____________ you are really Robbie Williams? Kevin: No, not very often. I try to look like Robbie. I wear the same (4) ____________ and my (5) ____________ is the same, but people don't often think I'm really Robbie Williams. June: What are you doing (6) ____________? Kevin: This evening, I'm going to a party in London. It's a 21st birthday party and I'm singing five Robbie Williams songs. June: Do you (7) ____________ your job? Kevin: Yes, I love it. It's never (8) ____________ and I get up (9) ____________ every morning. June: Do you like Robbie Williams's music? Kevin: Yes, I do. But I always listen to it when I'm working so I (10) ____________ listen to it at home.

Trong 1 đường tròn tâm O bán kính 25cm, 2 dây AB và CD song song với nhau. Biết AB=40cm, CD=48cm. Tính khoảng cách giữa 2 dây ấy.

Lm giúp mk 1 câu số 11 th ạ, mk cần gấp

62.You (not write)......................to your penfriend very often,but he(write).................to you every week. 63.The sun always(rise)..................in the East.Look,it(rise)............................! 64.I don’t think I (go)........................out tonight.I’m too tired. 65.Ba enjoy (go)...................to the circus. 66.Nam doesn’t like(play)......................football but he like (watch)..................football match on TV. 67.I hate(get up)............................early in the winter days.

Bài 5: Cho hình vẽ sau: a. Chứng minh: a//b b. Tính số đo góc: B1, A2, A3

bạn chỉ cần bấm trên mt bằng cách thay những chữ in nghiêng thành X và ấn shift solve) là sao ạ ai bày em cách bấm chi tiết với :(( ai cứu với

Giúp mk với ạ . Đúng và nhanh nhất mk vote + cảm ơn + ctlhn ạ .

test 3 vs 4 ạ Question 5: The city has recently set _____ a library in the West Suburb. A. up B. off C. out D. down Question 6: Nam didn’t know________ to find more information about the course. A. what B. why C. where D. while Question 7: He asked________ it was too early to apply for the course. A. if B. for C. when D. that Question 8: I couldn’t sleep last night________ the bar nearby played music so loudly. A. although B. so that C. while D. because Question 9: Lots of people choose to buy houses in the suburbs_________ they can avoid the noise and pollution in the city. A. although B. when C. so that D. so as Question 10: You should _______ the shoes when coming into the Japanese houses A. take off B. put on C. get off D. take on Question 11: My grandfather is the___ oldest artisan in the village; Ngoc`s grandfather is the oldest. A. first B. second C. most D. one Question 12: Eating _______ food is extremely important in order to maintain a good health. A. fatty B. nutritious C. junk D. salty Question 13: I've_______ the product catalogue and decided to buy this table. A. found out B. closed down C. looked through D. lived on Question 14: Today’s cities are_______than cities in previous times. A lots larger B much larger C as large D the largest Question 15: He asked_______it was too early to apply for the course. A. if B for C. when D that Question 16: This work doesn’t bother me. I_______hard. I've worked hard all my life. A. used to working B. used to work C. am used to work D. am used to work Write the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. Question 17: I also passed on the news I had heard from the town and the other villages. A. tell B. told C. say D. listened Question 18 : The doctor wanted to go over the test results with his patients. A. refuse B. make a note C. examine D. see Write the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Question 19: . Do you want to lie in a metropolitan city? A. rural B. urban C. countryside D. A&C Question 20: The simplicity of form makes English easy to learn. A. complication B. openness C. difficulty D. fluency