1 watched

2 locking - was - dropped

4 would finish

5 write - will try - to make

5 left

6 Does - asspoint

III

1 handle

2 satisfying

3 conservation

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bài 2

CaCO3-to>CaO+CO2

CO2+NaOH->NaHCO3

NaHCO3+NaOH->Na2CO3+H2O

Na2CO3+H2SO4->Na2SO4+H2O+CO2

18:

a: \(K=2\cdot\dfrac{\sqrt{a}-\sqrt{a}+1}{\sqrt{a}\left(\sqrt{a}-1\right)}\cdot\dfrac{a\left(a-1\right)}{\sqrt{a}+1}\)

\(=\dfrac{2\sqrt{a}\left(\sqrt{a}+1\right)}{\sqrt{a}+1}=2\sqrt{a}\)

b: K=căn 2012

=>căn 4a=căn 2012

=>4a=2012

=>a=503

Refer:

Fill in an appropriate word in each blank.

Kipling was the first writer (1) was expressed the faith and national pride. He was (2) born in Bombay India (3) in 1865 and was taken (4) to England to (5) be educated at the (6) age of 6. But at the age of 17 he returned (7) to India and became a journalist. (8) by this time he (9) was a great amount of prose and portry. After wards he returned to England and travelled in Japan and America. He received the 1907 Nobel (10) prize for literature and died in 1936 while he was working on his autbiographical notes.

who - born - in - to - be - age - to - by - was - prize

1b

2d 3e 4a 5c

A A B A B A

1 - B

2 - D

3 - E

4 - A

5 - C

Bài 2

1 A

2 A

3 B

4 A

5 D

6 B

1-b

2-d

3-e

4-a

5-c

ex2

1a

2a

3b

4a

5b

6a

Bài 7: 

a) Ta có: \(x^2-mx-1=0\)

nên a=1; b=-m; c=-1

Vì \(ac=1\cdot\left(-1\right)=-1< 0\)

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1-c