a) $6^{5}$ : $6^{3}$ : $6^{2}$ b) $7^{2}$ `:` 7 + ($9^{2021}$ : $9^{2020}$) c) $2009^{0}$ + $7091^{0}$ + 1 d) 5 . $(12-9)^{2}$ + 14 . (10 - 23) - $5^{7}$ : $5^{5}$ e) $2^{2}$ + 3 . $4^{2}$ + $2^{5}$ Giúp em với để em đi ngủ ạ

2 câu trả lời

a) $6^{5}$ `:` $6^{3}$ `:` $6^{2}$

`=` $6^{5-3-2}$

`=` $6^{0}$

$= 1$

b) $7^{2}$ `:` `7` `+` ($9^{2021}$ `:` $9^{2020}$)

`=` $7^{2-1}$ `+` ($9^{2021-2020}$)

`=` $7^{1}$ `+` $9^{1}$

$= 7 + 9$

$= 16$

c) $2009^{0}$ `+` $7091^{0}$ `+` 1

$= 1 + 1 + 1$

$= 3$

d) `5` `.` $(12-9)^{2}$ `+` `14` `.` (`10` `-` `23`) - $5^{7}$ `:` $5^{5}$

`=` `5` `.` $3^{2}$ `+` `14` `.` `(-13) `-` $5^{2}$

`=` `5` `.` `9` `+` `14` . `(-13)` `-` `25`

`=` `45` `+` `(-182)` `-` `25`

`=` `-(182 - 45)` `-` `25`

`=` `-137` `-` `25`

`=` `-137` `+` `(-25)`

`=` `-(137 + 25)`

`=` `-162`

e) $2^{2}$ `+` `3` . $4^{2}$ `+` $2^{5}$

$= 4 + 3 . 16 + 32$

$= 4 + 48 + 32$

$= 52 + 32$

$= 84$

Đáp án+Giải thích các bước giải:

 a)

$6^{5}:6^{3}:6^{2}=6^{5-3-2}=6^{0}=1$

b)

$7^{2}:7+(9^{2021}:9^{2020})=7^{2-1}+9^{2021-2020}=7+9=16$

c)

$2009^{0}+7091^{0}+1=1+1+1=3$

d)

$5.(12-9)^2+14.(10-23)-5^{7}:5^{5}=5.3^2-14.13-5^{7-5}=45-182-25=-162$

e)

$2^{2}+3.4^2+2^5=4+3.16+32=4+48+32=84$

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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