\(A=\frac{4}{3}.\frac{9}{8}.\frac{16}{15}.\frac{25}{24}.\frac{36}{35}......\frac{9801}{9800}=\frac{\left(2.3.4.5....99\right)^2}{1.3.2.4.3.5.4.6.....98.100}=\frac{2.3.4.5...99}{1.2.3.4.....98}.\frac{2.3.4.5....99}{3.4.5.6......100}=\frac{99}{1}.\frac{2}{100}=\frac{99}{50}\)

UNG HO TO NHA

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Bài 6; S_hcn= 3150

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 số 3825 đó bạn

1. If you ___ something, you should patent it as quickly as possible

A. invented

B. will invent

C. have invented

D. are inventing

2.Americans rarely shake hands to say goodbye, except ___ business occasions.

A. during

B. at

C. on

D. in

ĐIỀN TỪ THÍCH HỢP VÀ CHO BIẾT TẠI SAO ĐIỀN TỪ ĐÓ:

1.My parents don't like TV.They prefer(do)...doing..... other things

2.I guess we just like(do)....doing..........diffrent thing

3.My uncle doesn't like(watch).........watching........TV

4.There are (not be).......not.......good programs for teenagers

5.I don't like watching sports.I prefer(take part in)..........taking part in ........them

6.I don't like watching sports.I prefer(take part in)..........taking part in ..............them

7.Teenagers like(listen).........listening...............to the lastest pop music

8.Many people(not have)..............didn't have............TV sets thirty years ago