Câu 1: Cho biết X và Y tạo được các hợp chất như sau: X2O3 và HY. Biết O là hóa trị của 2

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hòa tan 15,2 gam hỡn hợp feco3 và mg có tle kl mfeco3/mg=9/29 bằng dd h2so4 loãng dư đc hỗn h Y .tính ti khối hơi Y so H2 và mol h2so4 tgia p ứng

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cho 3 tỉ số = nhau a/b+c=b/c+a=c/a+b tìm giá trị mỗi tỉ số

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giúp mình vs I think most people in the city are there be because of work, so a lot of people are rushing, and they’ve got deadlines and appointments to meet. So they can come across as a bit ruder than perhaps people in the suburbs who have less pressure on them. Emma I live in the city. Where I live is kind of quiet, but it depends on the time of the day, and sometimes there is like a little restaurant in the area, and people tend to go there. Different cultures, hard - working people. It’s a very nice community. It’s very clean, which is kind of different from the city because the city’s kind of messy, but they maintain it, and they keep it very nice. I enjoy living in the city because it’s quick access to everything or you don’t have to travel in a car or go down an hour or two to the mall Natalie I really enjoy living in the city because it’s very busy, and there’s always something to do. There are always bars to go, there are restaurants, there’s plenty to do. The commute to work is very short - it only takes me about 20 minutes to get to work by public transportation. And, yeah, I really like it because there’s lots of people with similar interests and very interesting people to speak to all the time. 1. Chris says people in the cities can on first impression seem__________ than people in the suburbs. A. more intelligent B. ruder C. more stressed out 2. Emma likes living in the city because of__________. A. cultural events B. her short commute C. the convenience 3. According to Natalie, one advantage of living in the city is that__________ A. it’s more exciting B. it’s busier C. it’s less expensive 4. One of the reasons Natalie likes living in the city is the__________ A. culture B. social life C. employment 5. Emma thinks__________ . A. her city is like the suburb B. her city is messy C. her city is clean.

The first major cause for stress is school. Test (1) , trying to achieve excellent grades, starting a new school, trying to fit in, those can cause stress at school, stress cannot be always (2) , some will cause pressure that will cause one (3) work harder. But mainly stress leads to headaches, lack (4) concentration, forgetfulness, or stomachaches. I understand this past couple weeks I have (5) more stress than I ever have felt before. I had these school comp papers due, Seneys huge test coming up, and semester tests (6) general; this made me feel large amount of stress. The further students find (7) in school, the extra stress they feel over trying to (8) out the perfect college and deciding what to do with their lives. I know next year college with only cause additional stress (9) myself and family dealing with financial aid. (10) school is a major source for stress. 1. A. took B. take C. taking D. taken 2. A. good B. terrible C. interesting D. bad - tempered 3. A. by B. in C. with D. to 4. A. of B. with C. on D. out 5. A. removed B. undertaken C. gone D. flown 6. A. on B. by C. in D. at 7. A. ourselves B. themselves C. herself D. myself 8. A. search B. go C. watch D. make 9. A. on B. with C. to D.for 10. A. Addition B. Conclusion C. Again D. Summary

So sánh a)√7 - √5 và √5 - √3 b) √15 - √14 và √14 - √13 c) √105 - √101 và √101 -97 Giúp mình nha :3 ( làm 1 phần cũng được, mình cần phương pháp giải thôi :33 )

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