Biết rằng tổng của 11 số lẻ liên tiếp là 2299. Tìm giá trị của số lớn nhất.

2 câu trả lời

Đáp án + Giải thích các bước giải:

Gọi số lẻ nhỏ nhất là ` n `

Ta có các số lẻ tiếp theo là:

` n + 2 ; n + 4 ; n + 6 ; n + 8;.......; n + 16 ; n + 18 ; n + 20 `

Vì tổng của `11` số lẻ đó là `2299 ` 

` ⇒ n + n + 2 + n + 4 + n + 6 + ......... + n + 18 + n + 20 = 2299 `

` ⇒ 11n + 110 = 2299 `

` ⇒ 11n = 2189 `

` ⇒ n = 199 `

Số lẻ lớn nhất là: ` n + 20 = 199 + 20 = 219 `

Gọi số lẻ nhỏ nhất là `x`, ta có các số lẻ tiếp theo là: `x + 2;x + 4;....; x + 18;x +20`

Do tổng của `11` số lẻ liên tiếp là `2299`

`=>` `x + 2 + x + 4 + .... + x + 18 + x + 20 = 2299`

`=>` `(x + x + ..... + x) + (2 + 4 + .... + 18 + 20) = 2299`

`=>` `11x + 110 = 2299`

`=>` `11x = 2299 - 110`

`=>` `11x = 2189`

`=>` `x = 2189 : 11`

`=>` `x = 199`

`=>` Số lẻ lớn nhất là: `x + 20 = 199 + 20 = 219`

Vậy số lẻ lớn nhất là `219` 

Câu hỏi trong lớp Xem thêm

I. Circle the correct one. “Too or Enough” 1) This car is too/enough old. We cannot go anywhere. 2) This book is too/enough thick for me to read. 3) That dress is cheap too/enough to buy. 4) This question is too/enough complicated to answer. 5) Everybody is too/enough excited about the holiday to focus on their work. 6) I can join that club. I’m young too/enough. 7) She can’t come with us to the bar. She’s too/enough young. 8) We have too/enough eggs to make a cake. 9) Do we have too/enough time to catch the bus? 10)This boy is too/enough noisy. I can’t study! 11)Mary’s room is too/enough dirty. Her mom is angry. 12)Tom is tall too/enough to join a basketball team. 13)This bag is too/enough heavy. I can’t carry it. II. Complete with “too” or “enough”. 1- She is clever ........................ to pass the test. 2- The skirt is ........................ long for you. 3- Kate is .......................young to drive a car. 4- There is ......................... meat in the fridge for the whole week. 5- I didn’t work hard ........................ to pass the exam. 6- We can’t buy the car because it is .......................expensive. 7- He can’t sleep because he drinks .......................much coffee. 8- Are you tall ...................... to reach that shelf? 9- They often take the bus to school because it’s ................... far to walk. 10- She isn’t fast ...................... to win the race. 11- There’s .......................food for everyone to eat. 12- She isn’t speaking clearly ................for me to understand. III. Complete the sentences with “too – enough” by using the words given. 1) I don’t want to eat that soup. It is _______________________. ( cold ) 2) She can’t come to party with us. She isn’t _______________________. ( old ) 3) They need much money. That car is _______________________ to buy. ( expensive ) 4) We don’t need to worry about the food. It is _______________________. (fresh ) 5) I missed the bus because I got up _______________________. ( late ) 6) I cannot buy that dress. It isn’t _______________________ for me to buy. ( cheap ) 7) I cannot climb that mountain. It is _______________________. ( high ) 8) You should help your sister. She is _______________________ to eat herself. (young) 9) It is _______________________ to see the way. ( foggy ) 10) He is _______________________ to win the race. ( fast ) 11) He is _______________________ to be the headmaster. ( qualified ) 12) Don’t want any help from him. He is _____________________ to help anyone. (rude) 13) The movie was _______________________. I couldn’t watch it. ( boring ) 14) Ben is _______________________ to solve the problems. He never studies. ( lazy ) 15) The questions were _______________________ to solve. ( difficult ) 16) Jeremy is _______________________ to talk people. ( shy ) 17) Ashley is _______________________ to pass the test. ( hardworking ) 18) I can’t wear this t-shirt. It is _______________________. ( small ) Giúp mk vs, tuy ns dài nhưg rấc cần sự giúp đỡ! Mk cần 2 bn lm ạ, bn nào có sức thì làm 2 bài, còn bn còn lại lm 1 bài a

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