Mik nghĩ môn toán thì sẽ khó hơn vì nó lí luận dài dòng phức tạp nhưng cả hai môn toán và anh đều có tầm quan trọng như nhau 

Vì a;a+1;a+2;a+3 là bốn số nguyên liên tiếp

nên \(a\left(a+1\right)\left(a+2\right)\left(a+3\right)⋮4!\)

=>\(A⋮4\)

1. Yes, I usually try to be aware of what is in the food I eat. because I read labels on packaged foods to check for ingredients, nutritional information, and possible allergens
2. i always eat healthy and natural food because it's very good for my health
3. i eat fast food about twice a week because of its typically high levels of unhealthy fats, sugars, and sodium

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câu hỏi của bạn đâu?

Bài 2:

a: \(\dfrac{5}{2}-x=\dfrac{27}{8}\)

=>\(x=\dfrac{5}{2}-\dfrac{27}{8}=\dfrac{20}{8}-\dfrac{27}{8}=-\dfrac{7}{8}\)

b: \(-\dfrac{1}{3}+\dfrac{4}{10}x=0,2\)

=>\(\dfrac{2}{5}x=0,2+\dfrac{1}{3}=\dfrac{1}{5}+\dfrac{1}{3}=\dfrac{8}{15}\)

=>\(x=\dfrac{8}{15}:\dfrac{2}{5}=\dfrac{8}{15}\cdot\dfrac{5}{2}=\dfrac{40}{30}=\dfrac{4}{3}\)

c: \(\left(3x+2\right)^2=\dfrac{25}{49}\)

=>\(\left[{}\begin{matrix}3x+2=\dfrac{5}{7}\\3x+2=-\dfrac{5}{7}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}3x=\dfrac{5}{7}-2=-\dfrac{9}{7}\\3x=-\dfrac{5}{7}-2=-\dfrac{19}{7}\end{matrix}\right.\)

=>\(\left[{}\begin{matrix}x=-\dfrac{3}{7}\\x=-\dfrac{19}{21}\end{matrix}\right.\)

Bài 1:

a: \(\dfrac{5}{6}+\dfrac{-11}{30}+\dfrac{7}{5}\)

\(=\dfrac{25}{30}-\dfrac{11}{30}+\dfrac{42}{30}=\dfrac{56}{30}=\dfrac{28}{15}\)

b: \(\left(-\dfrac{4}{5}\right)^2\cdot\dfrac{57}{2}+\dfrac{-7}{2}\cdot\left(-\dfrac{4}{5}\right)^2\)

\(=\left(-\dfrac{4}{5}\right)^2\left(\dfrac{57}{2}-\dfrac{7}{2}\right)=\dfrac{16}{25}\cdot25=16\)

c: \(\left(\dfrac{7}{25}-1\dfrac{2}{9}\right)-\left(\dfrac{23}{54}-\dfrac{18}{25}\right)+\dfrac{-31}{54}\)

\(=\dfrac{7}{25}-\dfrac{11}{9}-\dfrac{23}{54}+\dfrac{18}{25}-\dfrac{31}{54}\)

\(=\left(\dfrac{7}{25}+\dfrac{18}{25}\right)-\left(\dfrac{23}{54}+\dfrac{31}{54}\right)-\dfrac{11}{9}=1-1-\dfrac{11}{9}=-\dfrac{11}{9}\)

Câu 2:

a: \(x-\dfrac{1}{3}=\dfrac{5}{2}\)

=>\(x=\dfrac{5}{2}+\dfrac{1}{3}=\dfrac{15}{6}+\dfrac{2}{6}=\dfrac{17}{6}\)

b: \(\left(1-2x\right)^2=\dfrac{4}{9}\)

=>\(\left(2x-1\right)^2=\dfrac{4}{9}\)

=>\(\left[{}\begin{matrix}2x-1=\dfrac{2}{3}\\2x-1=-\dfrac{2}{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=\dfrac{5}{3}\\2x=\dfrac{1}{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{5}{6}\\x=\dfrac{1}{6}\end{matrix}\right.\)

Câu 1:

a: \(-\dfrac{4}{3}+\dfrac{3}{2}:\dfrac{9}{4}\)

\(=\dfrac{-4}{3}+\dfrac{3}{2}\cdot\dfrac{4}{9}\)

\(=\dfrac{-4}{3}+\dfrac{2}{3}=-\dfrac{2}{3}\)

b: \(\left(\dfrac{10}{9}+\dfrac{13}{7}\right)-\left(\dfrac{19}{9}-\dfrac{1}{7}\right)\)

\(=\dfrac{10}{9}+\dfrac{13}{7}-\dfrac{19}{9}+\dfrac{1}{7}=\left(\dfrac{10}{9}-\dfrac{19}{9}\right)+\left(\dfrac{13}{7}+\dfrac{1}{7}\right)\)

=-1+2

=1

juan ko anh thịnh

1/5 giờ=12 phút

\(1\dfrac{1}{3}phút=80\left(giây\right)\)

7m45cm=745cm

\(\dfrac{1}{5}giờ=\dfrac{1}{5}.60\left(phút\right)=12\left(phút\right)\)

\(1\dfrac{1}{3}phút=\dfrac{4}{3}.60\left(giây\right)=80\left(giây\right)\)

\(7m45cm=700+45\left(cm\right)=745\left(cm\right)\)

\(45ha50dam=4500+500\left(m\right)=5000\left(m\right)\)

\(-\dfrac{4}{3}+\dfrac{3}{2}:\dfrac{27}{12}=\dfrac{-4}{3}+\dfrac{3}{2}\cdot\dfrac{12}{27}\)

\(=\dfrac{-4}{3}+\dfrac{3}{2}\cdot\dfrac{4}{9}=\dfrac{-4}{3}+\dfrac{2}{3}=-\dfrac{2}{3}\)

Sure, let's work through the exercises step by step.

### I. Choose the word whose pronunciation is different from that of the others.

1. **D. pour** (The others have the /aʊ/ sound, while "pour" has the /ɔ:/ sound)
2. **C. favourite** (The others have the /ai/ sound, while "favourite" has the /eɪ/ sound)
3. **B. repeat** (The others have the /ɪər/ sound, while "repeat" has the /iː/ sound)
4. **A. doctor** (The others have the /oʊ/ sound, while "doctor" has the /ɒ/ sound)

### II. Choose A, B, C, or D to complete the sentences.

1. Hoa is sitting _______________ her parents.
   - **D. between**

2. The Nile river is _______________ than the Mekong river.
   - **B. longer**

3. If the weather ____________ good, I ___________ camping with classmates.
   - **A. is / will go**

4. Hi-tech robots will be able to look _______________ children in the future.
   - **C. after**

5. The food is very _______________.
   - **B. delicious**

6. Many girls and women _______________ aerobics to keep fit.
   - **C. do**

7. Hai can _______________ boxing well.
   - **A. do**

8. In the future, we _______________ go to the moon for our holiday.
   - **B. might**

### III. Write the past and past participle form of the verbs.

1. do – **did** – **done**
2. get – **got** – **gotten/got**
3. teach – **taught** – **taught**
4. give – **gave** – **given**
5. meet – **met** – **met**
6. have – **had** – **had**
7. eat – **ate** – **eaten**
8. ride – **rode** – **ridden**
9. build – **built** – **built**
10. see – **saw** – **seen**

### IV. Supply the correct form of the verbs.

1. Nam **will buy** a new laptop tomorrow.
2. He **did not eat** fish last night.
3. Mary **studies** in the school in the afternoon.
4. Look! The bus **is coming**.
5. Her sister **is not cooking** dinner now. She **is reading**.
6. There **are** no flowers in my garden.
7. Tam and her friend always **go** to school early.
8. **Have** you **seen** a good movie yet?

### V. Arrange the words into the sentence.

1. I have been to Hanoi three times.
2. My brother is the tallest person.
3. He lives very far from his office.
4. Where did you play badminton yesterday?

### VI. Match the verbs in A with the words in B.

0. play - **f. badminton**

1. speak - **a language**
2. go - **swimming**
3. fly - **a kite**
4. have - **dinner**
5. do - **exercise**

### VII. Use words in the brackets to combine each pair of sentences below.

1. If we pollute the air, we will have breathing problems.
2. Because it is raining very hard, we will not go on a picnic tomorrow.

tại sao câu số 4 bài 1 lại chọn after v ạ?

a: Vì \(32⋮4\)

nên \(32\cdot27\cdot14⋮4\)

=>\(A⋮4\)

b: \(20⋮4\)

=>\(20\cdot43\cdot41⋮4\)

=>\(B⋮4\)

c: \(124⋮4\)

=>\(124\cdot45\cdot29⋮4\)

=>\(C⋮4\)

d: \(22\cdot2=44⋮4\)

=>\(22\cdot127\cdot2\cdot15⋮4\)

=>\(D⋮4\)

a) A = 32 . 27 . 14

= 4 . 8 . 27 . 14 chia hết cho 4

b) B = 20 . 43 . 41

= 4 . 5 . 43 . 41 chia hết cho 4

c) C = 124 . 45 . 29

= 4 . 31 . 45 . 29 chia hết cho 4

d) D = 22 . 127 . 2 . 15

= 2 . 11 . 127 . 2 . 15

= ( 2 . 2 ) . 11 . 127 . 15

= 4 . 11 . 127 . 15 chia hết cho 4

Vậy tất cả các tích trên đều chia hết cho 4