Khối lượng bình thép rỗng : `50` `(kg)` Khi thêm oxi thì thành `66` `(kg)`
`-> m_(text{oxi}) = 66 - 50 = 16` `(kg)`
`-> m_(text{oxi}) = 16000` `(gam)`
Số mol phân tử oxi : `16000/32 = 500` `(mol)`
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Cali:Đom đóm Y/c:ko loi,kẻ ngang Đẹp nhận xấu ko nhận
Combine each pair of sentences, using the correct coordinating conjunctions. 1. Cheo tells tales of chiiefs, heroes and lovely maidens. It offers a mix of romance, tragedy and comedy. -> ____________________________________________________________________________________ 2. She is a talented singer. He has prestige and responsibility. -> _____________________________________________________________________________________ 3. His voice is beautiful. His performance is not skillful. -> ______________________________________________________________________________________ 4. You can go with us to the event. You can stay home watching TV. -> ____________________________________________________________________________________ 5. The concert was cancelled at the last minute. We had to stay home. -> ________________________________________________________________________________ 6. The artist played passionately and skillfully. At the end of his performance, he got the hearty applause from the audience. -> ______________________________________________________________________________________ 7. Trong Hieu, the champion of Vietnam Idol 2015, tried his luck at the 2008 Eurovisin Song Contest. He didn’t succeed. -> _______________________________________________________________________________________ 8. The song is close to teenager’s emotional life. It is easily popular with them. -> ____________________________________________________________________________________ 9. Daniel made many promises. He had no intention of keeping them. -> ___________________________________________________________________________________ 10. Last night Marta had to study for a test. She went to the library. -> _______________________________________________________________________________________
Vẽ anime/chibi vui. Hôm nay tồi tàn quá ._.
Chọn câu đúng: 1.Hoa: What household chores do you often do? Long: ______________. A. Yes, I like shopping for groceries B. Well, I do the washing-up and take out the garbage C. My mother does the household chores in my family D. No, I don't like dong the household chores. 2.- What are your plans for the summer holiday? – I …………… a trip to Ha Long Bay with my family. A. am going to make B. will make C. would make D. was going to make 3.Be quiet! Your dad ……to the news. A. is listening B. listens C. was listening D. will listen 4. What he said is really……………. A. incredible B. incredibly C. incredibility D. incredibleness 5.19. In many cultures, the mother is usually the……………, who has to do most of the household chores. A. homemaker B. breadwinner C. contributor D. headmaster 6.He decided ……an English course last summer. A. to take B. take C. taking D. took 7. We all enjoy _________ English. A. to learn B. learning C. learn D. learned 8.4. It’s 8.30 now and my father…………………….to the radio. He ……………………. to it every evening. A. listens/ listens B. listens/ is listening C. is listening/ is listening D. is listening/ listens
a,x ²-2xy-4z ²+y ² tại x=6; y= -4 và z= 45 b,3(x-3)(x+7)+(x-4) ²+48 cần lời giải
Tính tổng các nghiệm trong đoạn (0;30) của phương trình tan x= tan 3x
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