\(\text{4.They are a happy family.}\)

3. Who is that woman?

4. How old is she?

5. Who is that boy?

6. How old is he?

7. Who is that girl?

8. How old is she?

\(\text{3. Who is that woman? 4. How old is she? 5. Who is that boy? 6. How old is he? 7. Who is that girl? 8. How old is she?}\)

em cũng học OLM cô ạ

a,Ta có : 

Theo tc dãy tỉ số bằng nhau

b, Ta có : 

write : your / our / their 

can we go to.\(your\).. house,please?

can we ride.\(your\)..bikes?

can I have..\(your\). homework,please?

can we be.\(your\).. friends?

write : your / our / their 

can we go to.\(your\).. house,please?

can we ride.\(your\)..bikes?

can I have.\(your\).. homework,please?

can we be.\(your\).. friends?

\(1+1=2\)

\(\dfrac{4}{5}\)=\(\dfrac{4x2}{5x2}\)=\(\dfrac{8}{10}\)

Vậy phân số bằng \(\dfrac{4}{5}\)là \(\dfrac{8}{10}\).

Bài giải

Lớp 4B có là :

52 + 2 = 54 ( học sinh )

Lớp 4C có là :

54 + 2 = 56 ( học sinh )

Trung bình mỗi lớp có là :

( 52 + 54 + 56) : 3 = 54 ( học sinh )

Đáp số : 54 học sinh.