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30 tháng 10 2021

là:9x300000=2700000

28 tháng 10 2021

Giúp em với ạ!

28 tháng 10 2021

BCNN (9,10) = {90}

28 tháng 10 2021

=90 nhé

28 tháng 10 2021

a, A = {0;2;4;14}

b, A = {5;7;13;31}

. Don't stand .................the TV I'm trying to watch this programme.A. behind             B. next to              C. under               D. in front of2. You should never stand .................a tree when it is raining.A. at                     B. under                C. between            D. on3. My mother is in the ..................baking a cake for my birthday.A. bathroom         B....
Đọc tiếp

. Don't stand .................the TV I'm trying to watch this programme.

A. behind             B. next to              C. under               D. in front of

2. You should never stand .................a tree when it is raining.

A. at                     B. under                C. between            D. on

3. My mother is in the ..................baking a cake for my birthday.

A. bathroom         B. dining-room      C. kitchen             D. bedroom

4. Please turn the ................. on. It's so hot in here.

A. fan                   B. light                  C. television                   D. faucet

5. The Tay and Nung people mostly live in ................. made of wood and bamboo.

A. apartments       B. stilt houses        C. town houses     D. villas

6. In our dining room, ............. four chairs and a table . We have breakfast there evening morning.

A. there is             B. there are            C. there isn't                   D. there aren't

7. ................. any children in the playground right now.

A. there is             B. there are            C. there isn't                   D. there aren't

8. I like my bedroom best. It's my ................. room.

A. beautiful          B. comfortable       C. wonderful        D. favourite

9. My room is so ................. ! Dirty clothes, toys, books are all over the floor!

A. messy              B. crazy                 C. tidy                  D. cozy

10. 'Where do you live? - ' '.................'

A. on the floor                                   B. in the kitchen  

C. in a town house                                      D. next to the bookshelf

2
29 tháng 10 2021

1-D /  2-B   /3-C   /4-A   /5-B   /6-B  /7-C     /8-D   /9-A   /10-C  

28 tháng 10 2021
Dap an B❥❥❥❥❥❥
DD
28 tháng 10 2021

\(B=4+2^2+2^3+...+2^{20}\)

\(2B=8+2^3+2^4+...+2^{21}\)

\(2B-B=\left(8+2^3+2^4+...+2^{21}\right)-\left(4+2^2+2^3+...+2^{20}\right)\)

\(B=8+2^{21}-\left(4+2^2\right)=2^{21}\)

Supply the correct form of the words in brackets.1. There are only 20_________in my class.                                                          (study)2. Some _________students do drawings and paintings in the art club.       (create)3. The class is _________; students do not stop talking to each other.                   (noise)4. Your room is a_________; please pick up your...
Đọc tiếp

Supply the correct form of the words in brackets.

1. There are only 20_________in my class.                                                          (study)

2. Some _________students do drawings and paintings in the art club.       (create)

3. The class is _________; students do not stop talking to each other.                   (noise)

4. Your room is a_________; please pick up your toys.                              (messy)

5. Every day, students learn English with English _________teacher.                   (speak)

6. In the afternoon, they can join many_________ clubs.                                     (interest)

7. My house is warm and_________.                                                                   (comfort)

8. Kids are not allowed to use_________ in math class.                              (calculate)

9. What is your_________ room, Tony?                                                    (favour)

10. I'm so _________ about my first day at school.                                              (excite)

1
28 tháng 10 2021

1. student

2. creative

3. noisy

4. mess

5. speaking

6. interesting

7. comfortable

8. calculation

9. favourite

10. excited

28 tháng 10 2021

a=810
b=9477:1053=9