1. Songkran is the biggest, longest and the most fun festival in Thailand.

2. It is a three-day water fight throughout the whole country.

3. Wild scene of exuberance can be seen throughout the Kingdom of music, where dancing and drinking people are drenched from head to toe.

4. Water guns like hose pipe or bucket can be used to splash people.

5. One thing is for certain: you will get wet!

Bạn tham khảo nhé.

a. Chu vi là \(\left(12+5\right).2=34\left(m\right)\)

Diện tích là \(12.5=60\left(m^2\right)=600000\left(cm^2\right)\)

b. Cần lát \(600000:\left(40.40\right)=375\) viên gạch

a) Chu vi lối đi là :

( 12 + 2 ) x 2 = 28 ( m )

Diện tích lối đi là :

12 x 2 = 24 ( m² )

b) Diện tích 1 viên gạch là :

40 x 40 = 1600 ( cm² ) = 0,16 m²

Cần số viên gạch là :

24 : 0,16 = 150 ( viên )

D

D

a b c c c a b c b b b c

1. a

2b

3c

4c

5. c

6,b

7. b

8. c

9b

10b

11b

12c

Bài 3 : 

(A) : Fe3O4

(B) : FeO

(D)  : Fe

(E) : FeS

(F)  : SO2

(G) : SO3

(H) : H2SO4

\(3Fe_2O_3 + CO \xrightarrow{t^o} 2Fe_3O_4 + CO_2\\ Fe_3O_4 + CO \xrightarrow{t^o} 3FeO + CO_2\\ FeO + CO \xrightarrow{t^o} Fe +C O_2\\ Fe + S \xrightarrow{t^o} FeS\\ 4FeS +75O_2 \xrightarrow{t^o} 2Fe_2O_3 +4SO_2\\ 2SO_2 + O_2 \xrightarrow{t^o} 2SO_3\\ SO_3 + H_2O \to H_2SO_4\\ 2FeS + 10H_2SO_4 \to Fe_2(SO_4)_3 + 9SO_2 + 10H_2O\)

Bài 4 : 

(A) : S

(B) : H2

(C) : O2

(D) : SO2

(E) : H2S

(F) : H2SO4

(G) : K2SO4

(H) : MnSO4

\(S + O_2 \xrightarrow{t^o} SO_2\\ S + H_2 \xrightarrow{t^o} H_2S\\ S + 2H_2SO_4 \to 3SO_2 + 2H_2O\\ SO_2 + 2H_2S \to3 S +2 H_2O\\ 5SO_2 +2 KMnO_4 + 2H_2O \to K_2SO_4 + 2MnSO_4 + 2H_2SO_4\)

h: \(\left(1+\dfrac{1}{3}-\dfrac{1}{4}\right)\cdot\left(\dfrac{4}{5}-\dfrac{3}{4}\right)^2\)

\(=\dfrac{12+4-3}{12}\cdot\left(\dfrac{16-15}{20}\right)^2\)

\(=\dfrac{5}{4}\cdot\dfrac{1}{20^2}=\dfrac{5}{1600}=\dfrac{1}{320}\)

a A>B

b C>D 

c D<E