Chứng minh `1/2^2+1/3^2+1/4^2+1/5^2+1/6^2+1/7^2+1/8^2+1/9^2+1/10^2+1/11^2+1/13^2+1/14^2+1/15^2+1/16^2+1/17^2+1/18^2+1/19^2+1/20^2+1/21^2+1/22^2+1/23^2+1/24^2+1/25^2+1/26^2+1/27^2+1/28^2+1/29^2+1/30^2+1/31^2+1/32^2+1/33^2+1/34^2+1/35^2+1/36^2+1/37^2+1/38^2+1/39^2+1/40^2+1/41^2+1/42^2+1/43^2+1/44^2+1/45^2+1/46^2+1/47^2+1/48^2+1/49^2+1/50^2+1/51^2+1/52^2+1/53^2+1/54^2+1/55^2+1/56^2+1/57^2+1/58^2+1/59^2+1/60^2+1/61^2+1/62^2+1/63^2+1/64^2+1/65^2+1/66^2+1/67^2+1/68^2+1/69^2+1/70^2+1/71^2+1/73^2+1/74^2+1/75^2+1/76^2+1/77^2+1/78^2+1/79^2+1/80^2+1/81^2+1/82^2+1/83^2+1/84^2+1/85^2+1/86^2+1/87^2+1/88^2+1/89^2+1/90^2+1/91^2+1/92^2+1/93^2+1/94^2+1/95^2+1/96^2+1/97^2+1/98^2+1/99^2+1/100^2<1/2`

REPORTED SPEECH I. Change into the reported speech. 1. He said “I have already read this book”. …………………………………………………………………… 2. Tom said to his sister “I want to buy a gift for our mother”. ……………………………………………………………………. 3. Mrs Brown said “they’d rather go out than be at home?" ……………………………………………………………………. 4. “I don’t know the girl over there?" Tom said. ……………………………………………………………………….. 5. Mother said "Nam, You have to clean the room tommorrovv?” ……………………………………………………………………….. II. Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions. 1. "I'm a big fan of U23.” Derek said. - Derek said he ____ a big fan of U23. A. was B. has been C. were D. had been 2. "We're watching TV," said the twins. - The twins said they ____ TV. A. watched B. were watching C. have been watching D. had watched 3. “You've been annoying me all day!" my mum said. - My mum said I ____ her all day. A. annoyed B. was annoying C. have been annoying D. had been annoying 4. "The dog ate my homework!” said Ivan. - Ivan said the dog his homework. A. was eating B. has eaten C.ate D. had eaten 5. "At one o'clock, I was having lunch," said Molly. - Molly said she ____ lunch at one o'clock. A. had been having B. has had C. is having D. has been having 6. "You'll get wet without an umbrella," Dad said. - Dad said I ____ wet without an umbrella. A. will be getting B. got C. would be getting D. would get 7. "He can juggle five balls!" said Angie. - Angie said he ____ five balls. A. juggled B. had juggled C. would juggle D. could juggle 8. “You must give me your essays," Mrs Vine said. - Mrs Vine said we ____give her our essays. A. were having to B. would have to C. had to D. must 9. "Here, waste is growing twice as fast as the population," the lecturer said. A. The lecturer said that there, waste was growing twice as fast as the population. B. The lecturer said that here, waste is growing twice as fast as the population. C. The lecturer said that there, waste has been growing twice as fast as the population. D. The lecturer said that there, waste had been growing twice as fast as the population. 10. The shop assistant finally agreed ____ a full refund. A. giving me B. to give me C. give to me D. to me to give 11. "I will help you with your CV, Mary," Peter said. A. Peter advised Mary to write the CV. B. Peter promised to help Mary.

giải giúp mik câu 1 vs ạ ai cs lòg tốt vẽ giúp cái hình lun vs(7h15 mik nộp bài mog các bn giúp nhanh vs nha

"Chào các pác, acj và các pạn - Lời đầu tiên, xin gửi tới mn 1 lời chào trân trọng nhứt ." Shine ( or Shin or Phương ) - Mk là tvm, mong mn "giúp đỡ ". Đề: Vẽ đou mầm bỡ ngỡ

bằng hiểu biết của mình em hãy vẽ sơ đồ tư duy về lịch sử nước ta từ nguồn gốc xa xưa đến thế kỉ 10

Giúp mình nha mình sẽ cho quà và thưởng

Giúp mình b4, b5 nha, mik đang cần gấp

Giải hộ em với ạ sáng mai em phải nộp rồi em hứa sẽ cho ctlhn

Hãy lựa 3 số trong những số cho sau đây sao cho đó là độ dài 3 cạnh của 1 tam giác. Gạch dưới những bộ ba là độ dài 3 cạnh một tam giác vuông: 3, 4, 5, 6, 8, 10.

Giúp mình nha mình sẽ cho quà và thưởng