các bn giải và trình bày rõ ràng các làm giúp mình đc ko

 \(\dfrac{27^{15}.9^{20}}{81^{12}.3^{36}}\)

Thank you 

1. My brother goes to school on foot everyday

2. The magazine is on the table

3. There are a lot of cattle in Mr.Lam's farm

4. Hung is Lan's older brother

5. Mrs. Hong is Mai's mother

6. The armchair is behind the table

7. Pink and yellow are my favorite colors

8. The green washing machine is smaller than the white one

9. What beautiful weather!

10. What very interesting books

1. b

2. d

3. b

4. c

5. a

Tính nhanh (nếu có thể):

a) \(5\dfrac{5}{27}+\dfrac{7}{23}+0,5.\dfrac{5}{27}+\dfrac{16}{23}\)

b) \(\dfrac{10^9.49^4}{14^8.25^5}\)

các bn ghi rõ cách giải giùm mình đcc ko, mình cảm ơn