Chứng tỏ: A= 6/1.4+6/4.7+6/7.10+...+6/n(n+3) với n thuộc N*

Chuyên Sinh cứu em câu này với huhu

II.Chọn đáp án đúng. 1. There are many why it is important to have a hobby. A. answers B. reasons C. details D. facts 2. Will you making models in the future? A. pick up B. look for C. take up D. find 3. Do you think that hobby is and boring? A. easy B. difficult C. danger D. interesting 4. I love my sister’s paintings because she is very in using colours. A. careless B. care C. creative D. imagine 5. A hobby helps you to connect with people. A. other B. others C. another D. the other 6. I join a photography club, and all the members love a lot of beautiful photos. A. take B. taking C. make D. making 7. What does your father do his free time? A. in B. at C. on D. while 8. I think a hobby will always give you and help you . A. pleased - relax B. pleasure - relaxed C. pleased - relaxing D. pleasure - relax 9. You can share your stamps other collectors a stamp club. A. with - at B. to - at C. with - in D. to - in 10. I think this hobby does not cost you much, and you need is time. A. most B. all C. some D. all of 1. Nowadays people hours sitting in front of computers. A. take B. last C. set D. spend 12. I think you should take up swimming it is suitable for your health condition. A. so B. because C. although D. but 13. My family enjoys because we can sell vegetables and flowers money. A. garden - to B. gardening - for C. gardening - with D. garden - of 14. If your hobby is greeting card making, you can give your to your friends as presents. A. hobby B. money C. greetings D. products 15. My sister’s hobby is sewing, and she can get the sewing patterns from the magazines. A. fashion B. cooking C. sports D. science 16. My brother doesn’t like ice-skating because he thinks it is . A. danger B. in danger C. dangerous D. endangered 17. My sister is very keen on swimming, and she goes swimming three a week. A. time B. a time C. times D. timings 18. We often read the instructions carefully in order to make of the things we like best. A. meanings B. models C. copies D. uses 19. You need to be to follow eggshell carving because it may take two weeks to complete one shell. A. careful B. interested C. fit D. patient 20. If you choose sewing as your hobby, you will your own clothes. A. do B. make C. take D. get

Ai làm nhanh đúng 5 sao Phân tích các đa thức sau thành nhân tử

tìm số mol NaOH có trong 150 gam dd NaOH với nồng độ 12%

Ai trả lời nhanh nhất đc 30 điểm nha mn

Ai làm nhanh đúng 5 sao Phân tích các đa thức sau thành nhân tử

Rút gọn biểu thức nha mn .Cảm ơn mn nhiều ạ

Chứng minh phản chứng 1. nếu n^2 chia hết cho 3 thì n cũng chia hết cho 3 (n là số tự nhiên) 2. cho tam giác ABC và M là trung điểm AB, cmr: B,C,M không thẳng hàng

Bài 1:Điền dạng thích hợp của động từ trong ngoặc để hoàn thành các câu sau: 1.Did you enjoy(watch)______the comedy last night? 2.Many people prefer(do)______gardening after their retirement. 3.My cat dislikes(sleep)________on the floor. 4.My father doesn’t mind(work)______hard. 5.My cousin doesn’t like(study)_________Math and Chemistry. 6.They dislike(talk)__________with each other. 7.Jim and Jane don’t fancy(go)__________out tomorrow. 8.Did you hate(eat)______vegetables when you was small? 9.she didn’t prefer(tell)________him about her plan. 10.James enjoys(have)_______dinner in a luxury restaurant. 11.I hope my mother will enjoy(spend)_______time with her grandchildren. 12.Some people enjoy(take)______a shower in the morning. 13.I think your brother won’t mind(lend)________you a helping hand. 14.My boyfriend dislike(wait)____________. 15.What do you detest(do)__________the most?