23x55+45x23+250

=23x(55+45)+250

=23x100+250

=2300+250

=2550

`@` `\text {Ans}`

`\downarrow`

`(20+35) \times 33-45 \times 23-10 \times 23`

`= (20 + 35) \times 33 - 23 \times (45 + 10)`

`= (20 + 35) \times 33 - 23 \times 55`

`= 55 \times 33 - 23 \times 55`

`= 55 \times (33 - 23)`

`= 55 \times 10`

`= 550`

\(\left(20+35\right)\times33-45\times23-10\times23\)

\(=55\times33-45\times23-10\times23\)

\(=5\times\left(11\times33-9\times23-2\times23\right)\)

\(=5\times\left(363-207-46\right)\)

\(=5\times\left(363-253\right)\)

\(=5\times110\)

\(=550\)

Bài 1: 

a) Ta có: \(2\cdot4\cdot5\cdot25\cdot28\)

\(=\left(2\cdot5\right)\cdot\left(4\cdot25\right)\cdot28\)

\(=10\cdot100\cdot28\)

=28000

b) Ta có: \(45\cdot54+45\cdot23-35\cdot77\)

\(=45\left(54+23\right)-35\cdot77\)

\(=45\cdot77-35\cdot77\)

=770

1/Tính nhanh

a)  2.4.5.25.28

= (2.5) . (4.25) . 28

= 10 . 100 . 28

= 1000 . 28

= 28000

b) 45.54+45.23-35.77

= 45.(54 + 23) - 35.77

= 45.77 - 35.77

= (45 -35) . 77

= 10 . 77

= 770

2/Tìm x:

6.x + 108 : 9 = 24

6.x + 12 = 24

6.x = 24 - 12

6.x = 12

x = 12 :6 

x = 2

Vậy x=2

*Dấu chấm là dấu nhân nha *

Bài 2: 

Ta có: \(6x+108:9=24\)

nên 6x=12

hay x=2

câu 2: Bác tài bỏ xe đi bộ qua cầu

câu 3: Thắp que diêm

câu 4: Vào phòng số 3 (vì sư tử nhịn đói trong 3 năm thì đã chết hết)

câu 5: có 4 con

CÂU 1 : con lười ươi thường có thói quen là võ vào ngực mình tỏ vẻ tức giận nên khi nhặt lên nó cũng võ ngực và dao đâm vào ngực nó... nó chết

CÂU 2 : bác tài xế xuống xe và đi qua cầu thui, dễ mà

CÂU 3 : thì thắp que diêm trước cái đã

CÂU 4 : phòng số 3 là an toàn nhất cho hắn vì sư tử đói 3 năm thì hỏi bạn nó có còn sống trên đời hk ta ^_^

CÂU 5 : có 4 con vịt nè nha

CÂU 6 ( CÂU CUỐI CÙNG ) :  mình nghĩ là đập con ma xanh trước vì khi đập con ma xanh trước thì con ma xanh nó chết cái con ma đỏ thấy con ma xanh chết thì sợ xanh mặt nên nó thành con ma xanh mà ma xanh thì đập phát chết rùi nên chỉ cần đập thêm 1 phát nữa là nó chết, đủ 2 phát và 2 con ma chết hết. Nếu bạn hk hỉu thì tóm lại đập con ma xanh trước rùi đập con ma đỏ sau.

THẾ LÀ XONG, NẾU ĐÚNG HẾT THÌ THIK CHO MÌNH IK Ạ

LƯU Ý

Các bạn học sinh KHÔNG ĐƯỢC đăng các câu hỏi không liên quan đến Toán, hoặc các bài toán linh tinh gây nhiễu diễn đàn. Online Math có thể áp dụng các biện pháp như trừ điểm, thậm chí khóa vĩnh viễn tài khoản của bạn nếu vi phạm nội quy nhiều lần.

Chuyên mục Giúp tôi giải toán dành cho những bạn gặp bài toán khó hoặc có bài toán hay muốn chia sẻ. Bởi vậy các bạn học sinh chú ý không nên gửi bài linh tinh, không được có các hành vi nhằm gian lận điểm hỏi đáp như tạo câu hỏi và tự trả lời rồi chọn đúng.

Mỗi thành viên được gửi tối đa 5 câu hỏi trong 1 ngày

Các câu hỏi không liên quan đến toán lớp 1 - 9 các bạn có thể gửi lên trang web h.vn để được giải đáp tốt hơn.

1. office, Boss, evereyone, a few, aslo, important, many, them. 2. 1) What a delicious dinner! 2) .... is smaller than the new one. 3) She plays bathminton well 4) .... playing soccer to watching TV 5).... talking about the story? ( sorry :v câu 6) mk hơi rối :v) 7) .... in reading book 8) .... watch TV more than listening to music 9) .... not to go there alone ( chắc zậy :3) 10) .... we go to the movie 11) When is her birthday?

I) Listening

II) Read the following passage and complete it with the words in the box ( 1ms )
Also/ boss/ them/ office/ everyone/ important/ a few/ many

James Johnson is my name . I work in the main office of a big company . Twenty people work in that office evry day . Mr Wilson is my boss. He works very hard . Almost everyone works hard . Of course , a few people don’t work hard . Mr . Wilson has a private office . He also has a secretary . Mr . Wilson meets all of the important visitors. He writes many leters every day and sends them to customers .

III ) Complete the second sentence so that it has the same meaning as the first one .( 2ms )

1 ) This is a really delicious dinner .
What a delicious dinner !

2 ) This new refrigerator is bigger than the old one .
The old refrigerator is smaller than this new refrigerator.
3 ) She is a good badminton player .
She plays well.
4 ) My brother likes playing soccer than better than watching TV .
My brother prefers playing soccer to watching TV.

5 )Let’s talk about the story .
What about talking about the story?

6 ) Hoa studies math very well .
Hoa is good at studying Math.
7 ) She likes to read this book .
She is interested in reading this book.
8 ) I prefer watching TV to listening to music .
I like watching more better than listening to music.
9 ) You shouldn’t go there alone .
You ought to not going there alone.

10 ) Let’s go to the movie
Why don’t we go to the movie?

11 ) What is her date of birth ?
When is her birthday ?

III) Use the given words to write sentences ( 1,5 ms )

1 ) He /be / 15 / next Sunday .
\(\Rightarrow\) He will be 15 next Sunday.

2 ) His / date / birth / be / October / 2nd .
\(\Rightarrow\) His date of birth is on October 2nd.

3 ) The movie / start / in / ten minutes.
\(\Rightarrow\) The movie will start in ten minutes.
4 ) How old / you /be / your / next birthday ?
\(\Rightarrow\) How old will you be on your next birthday?
5) I / have / English test / next Thursday .
\(\Rightarrow\) I will have an English test next Thursday.
6 ) My friends / usually / call / my birthday .
\(\Rightarrow\) My friends usually calls me on my birthday.

7 ) What / your /telephone number ? . It / 630776 .
\(\Rightarrow\) What is your telephone number? It’s 630776
IV) Gives names of the subjects:
1. English language of American people

2. Math numbers , shapes.

3. Music songs , ways of singing and playing panos , guitars , etc .

4. History dates , events

5. Geography population , countries , region , maps .

V) Give the correct form of the words in parenthesesto complete the sentences .( 1 m )

1) I’m interested in playing soccer with my friends at recss . ( INTEREST )

2 ) I like English . It’s favorite subject ( FAVOR )

3 ) Hoa works very well at school and at home . (GOOD )

4 ) He is a worker. He works in a factory . ( WORK )

5 ) What is her weight ? . She is 45 kilos ( WEIGH )

6 ) These medicines can work well with your illness ( ILL )

7 ) We must cook fruit carefully before eating ( CARE )

8 ) Moderation in eating is very important ( IMPORTANCE )

VI) Supply the corect form or tense of the verbs in brackets . ( 1,75 ms )

1 ) My uncle ( play ) played soccer very well when he ( be ) was a boy .

2) I ( send ) will send you a letter when i come to London next month .

3 ) Our family ( go ) went to the zoo three days ago .

4 ) I prefer ( play ) playing video games to ( see ) seeing

5 ) Children must ( take ) take part in activities with others

6 ) ( You / come ) Did you come to Ha Noi last month ?

7 ) When I was ten , my family ( move ) moved to Ha Noi .

I) Listening

II) Read the following passage and complete it with the words in the box ( 1ms )
Also/ boss/ them/ office/ everyone/ important/ a few/ many

James Johnson is my name . I work in the main office of a big company. Twenty people work in that office every day . Mr Wilson is my boss. He works very hard . Almost everyone works hard . Of course , a few people don’t work hard . Mr . Wilson has a private office . He also has a secretary . Mr . Wilson meets all of the important visitors. He writes many leters every day and sends them to customers .

III ) Complete the second sentence so that it has the same meaning as the first one .( 2ms )

1 ) This is a really delicious dinner .
\(\Rightarrow\)What a delicious dinner !
2 ) This new refrigerator is bigger than the old one .
\(\Rightarrow\)The old refrigerator is smaller than the new one.
3 ) She is a good badminton player .
\(\Rightarrow\)She plays badminton well.
4 ) My brother likes playing soccer than better than watching TV .
\(\Rightarrow\)My brother prefers playing soccer to watching TV
5 )Let’s talk about the story .
\(\Rightarrow\)What about talking about the story?
6 ) Hoa studies math very well .
\(\Rightarrow\)Hoa is a good Math student
7 ) She likes to read this book .
\(\Rightarrow\)She is interested in reading this book
8 ) I prefer watching TV to listening to music .
\(\Rightarrow\)I like watching TV than listening to music
9 ) You shouldn’t go there alone .
\(\Rightarrow\)You ought not to go there alone
10 ) Let’s go to the movie
\(\Rightarrow\)Why don’t we go to the movie ?
11 ) What is her date of birth ?
\(\Rightarrow\)When is her birthday?
III) Use the given words to write sentences ( 1,5 ms )
1 ) He /be / 15 / next Sunday .
\(\Rightarrow\)He will be 15 next Sunday
2 ) His / date / birth / be / October / 2nd .
\(\Rightarrow\)His date of birth is on October 2nd
3 ) The movie / start / in / ten minutes.
\(\Rightarrow\)The movie will start in ten minutes
4 ) How old / you /be / your / next birthday ?
\(\Rightarrow\)How old will you be on your next birthday?
5) I / have / English test / next Thursday .
\(\Rightarrow\)I will have an English test next Thursday.
6 ) My friends / usually / call / my birthday .
\(\Rightarrow\)My friends usually call me on my birthday.
7 ) What / your /telephone number ? . It / 630776 .
\(\Rightarrow\)What is your telephone number? - It is 630776

IV) Gives names of the subjects:
1. English language of American people
2. Math numbers , shapes.
3. Music songs , ways of singing and playing panos , guitars , etc .
4 History dates , events
5 Geography population , countries , region , maps .
V) Give the correct form of the words in parenthesesto complete the sentences .( 1 m )
1) I’m interested in playing soccer with my friends at recess . (INTEREST )
2 ) I like English . It’s favorite subject ( FAVOR )
3 ) Hoa works very well at school and at home . (GOOD )
4 ) He is a worker. He works in a factory . ( WORK )
5 ) What is her weight? She is 45 kilos ( WEIGH )
6 ) These medicines can work well with your illness ( ILL )
7 ) We must cook fruit carefully before eating ( CARE )
8 ) Moderation in eating is very important ( IMPORTANCE )
VI) Supply the corect form or tense of the verbs in brackets . ( 1,75 ms )
1 ) My uncle ( play ) played soccer very well when he ( be ) was a boy .
2) I ( send ) will send you a letter when i come to London next month .
3 ) Our family ( go ) went to the zoo three days ago .
4 ) I prefer ( play ) playing video games to ( see ) seeing
5 ) Children must ( take ) take part in activities with other
6 ) ( You / come )Did you come to Ha Noi last month ?
7 ) When I was ten , my family ( move ) moved to Ha Noi

1. They aren’t as generous as they used to

à They …………used to be generous .............................

2. You need to wash your car at once.

à Your car ……need to be washed ( hoặc là : washing )……………

* Câu 1 mk ko chắc lắm ạ :) *

250+250+250+250=1000

250 x4 = 1000

k mình nhé!

250x4=1000

250+250+250+250=1000

250 + 250 + 250 + 250

=1000

\(250+250+250+250\)

\(=250.4\)

\(=1000\)

Dấu '' . '' là dấu nhân!

250 + 250 + 250 + 250 + 250

= 250 x 5 

= 1250

250+250+250+250+250=1250

k đi mk k lại

250 + 250 + 250 + 250 + 250 = 1250