11. If you go to HaNoi, you'll like it

13. If you see her, will you say hello to her?

15. If you panic, you won't manage it

1. Yes it is

2.Chung cake was invented by Prince Lang Lieu

3.Viet Nam

4.0 hiểu :v

5.The cake is boiled for about 12 hours 

1. Yes, it is.

2. Chung cake was invented by Prince Lang Lieu - the 18th Prince of Hung Emperor

3. Chung cake made from sticky rice, pork, green beans, pepper and onions

4. It is wrapped in dong leaves.

5. Chung cake is boiled for about 12 hours over a wood burning stove

1 saw

2 started

3 have lost

4 has already gone

5 arrived

6 Have you worn

7 hasn't been

8 had

9 played

10 Have you ever met

11 have never been

12 have seen

13 have already drunk

14 has already visit

15 slept

16 have eaten

17 Have you ever broken

18 has never driven

19 have read

20 caught

21 haven't painted

Câu 2

\((1) MnO_2 + 4HCl \to MnCl_2 + Cl_2 + 2H_2O\\ (2) Cl_2 + H_2 \xrightarrow{as} 2HCl\\ (3) 3Cl_2 + 2Fe \xrightarrow{t^o} 2FeCl_3\\ (4) 2FeCl_3 + Fe \to 3FeCl_2\\ (5) 2NaOH + Cl_2 \to NaCl + NaClO + H_2O\)

\((1) 4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3\\ (2) 2Fe + 3Cl_2 \xrightarrow{t^o} 2FeCl_3\\ (3) C + O_2 \xrightarrow{t^o} CO_2\\ (4) 2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2\\ (5) 4P + 5O_2 \xrightarrow{t^o} 2P_2O_5\\ (6) 2KClO_3 \xrightarrow{t^o} 2KCl + 3O_2\\ (7) Fe + H_2SO_4 \to FeSO_4 + H_2\\ (8) Cu + 2H_2SO_4 \to CuSO_4 + SO_2 + 2H_2O\\ (9) 2Fe + 6H_2SO_4 \to Fe_2(SO_4)_3 + 3SO_2 + 6H_2O\\ (10) 2Al + 6H_2SO_4 \to Al_2(SO_4)_3 + 3SO_2 + 6H_2O\)

đk : x khác -3 ; 1 

\(2x^2+6x+4=\left(2x-5\right)\left(x-1\right)\)

\(\Leftrightarrow6x+4=-7x+5\Leftrightarrow13x=1\Leftrightarrow x=\dfrac{1}{13}\)(tm) 

B(NGHĨ.LÀ.THẾ)

Xét tam giác ABC có: góc A+góc B+góc C=180^o

=>Góc B+góc C=180^o-góc A=180^o-60^o=120^o

Tổng tia phân giác của góc B và góc C là (góc B)/2+(góc C)/2

=(góc B+góc C)/2=120^o/2=60^o=>góc IBC+góc ICB=60^o

Xét tam giác BIC có: góc IBC+góc ICB+góc BIC=180^o

=>Góc BIC=180^o-(góc IBC+góc ICB)=180^o-60^o=120^o

Vậy góc BIC=60^o

Góc BIC+60^o=>chọn D