MC của 5/7; -3/21;-8/15 bằng bao nhiêu giải hộ em với ạ

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 $\text{MC}$ `5/7 ` ; `3/21` ; `-8/15`  $\text{chính là Bội của BCNN ( 7  ; 21 ; 15 ) ( MC $\neq$  0 ) }$

 $\text{Ta có : 7 = 7 }$

 $\text{21 = 7 . 3 }$

 $\text{15 = 3 . 5 }$

 $\text{→ BCNN ( 7  ; 21 ; 15 ) = 3 . 5 . 7 = 105 }$

 $\text{→ MC}$ `5/7` ; `-``3/21` ; `-``8/15`  $\text{= B ( 105 ) = { 105 ; 210 ; ....... }}$

 $\text{Vậy MC }$`5/7` ; `-``3/21` ; `-``8/15` $\text{= B ( 105 ) = { 105 ; 210 ; ....... }}$

 

$\text{ Ta có : }$

`{:(7 = 7),(21 = 3. 7),(15 = 3. 5):}} => BCNNNN( 7 ; 21 ; 15 ) = 3. 5. 7 = 105`

  $\text{ Vậy mẫu chung của }$ `5/7 ; -3/21 ; -8/15` $là$ `105`

$\text{ __________________________________________________________ }$

$-$ Lấy `B(105) \ne 0` cx đc bn nhé, nhưng nên lấy 105 là nhỏ nhất

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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