1 Show me the new hats which you bought last night

2 That is a company which produces diamond rings

3 My best friend who sings folk songs very well can compose songs

4 Zoe bought a new phone which is quite expensive yesterday

5 The man whom you met last week is her father

6 Zoe likes the blue T-shirt which she is wearing

7 Zoe has a sister whose name is Juma

8 The children were attracted by the show in which there were so many famous people

9 Tet is a festival that often happens in late January or early February

10 Jack is the boy who gave my mom a gift

1. Show me the new hats which you bought last night. 

2. That is a company which produces diamond rings. 

3. My best friend, who sings folk songs very well, can compose a song.

4. Zoe bough a new phone yesterday, which is expensive. 

5. The man who you met last week is her father. 

6. Zoe like the blue t-shirt which my sister is wearing. 

7. Zoe has a sister whose name is Juma.

8. The children were attracted by the show which there were so many famous people. 

9. Tet is a festival which often happens in late January or early February. 

10. Jack is the boy who gave my mom a gift.

\(n_{Al}=\dfrac{10,8}{27}=0,4mol\)

4Al + 3O₂ \(\underrightarrow{t^o}\) 2Al₂O₃

0,4     0,3         0,2              ( mol )

\(\Rightarrow n_{Al_2O_3}=0,2mol\)

\(V_{O_2}=0,3.24,79=7,437l\)

a: \(4Al+3O_2\rightarrow2Al_2O_3\)(đk: t độ)

b: \(n_{Al}=\dfrac{10.8}{27}=0.4\left(mol\right)\)

nên \(n_{Al_2O_3}=0.2\left(mol\right)\)

\(m_{Al_2O_3}=0.2\cdot102=20.4\left(g\right)\)

1A

2D

3B

4C

5D

6B

7B

8D

9A

gọi số đó là ab

ta có: ab=8x(a+b)

         a x 10 + b =8 x a + 8 x b

        a x 2=b x 7

      vậy : ab =72 

Gọi số đó là ab

Theo đề bài ta có:

   ab = 8( a+ b )

10a + b = 8a + 8b

      2a    = 7b  ( bớt mỗi bên đi 8a + b )

=> a = 7

   b = 2

   Vậy số cần tìm là 72

Số 72 nhé bạn. Ko có thờ gian làm nên mk ghi đáp số thôi nhé!

CHÚC BẠN HỌC TỐT

Bn cắt ra cho mn dễ làm nha

Bài 11:

a: \(4x^2-1=\left(2x-1\right)\left(2x+1\right)\)

b: \(25x^2-\dfrac{9}{100}=\left(5x-\dfrac{3}{10}\right)\left(5x+\dfrac{3}{10}\right)\)

c: \(9x^2-\dfrac{1}{4}=\left(3x-\dfrac{1}{2}\right)\left(3x+\dfrac{1}{2}\right)\)

d: \(\left(x-y\right)^2-4=\left(x-y-2\right)\left(x-y+2\right)\)

ảnh nét hơn nè

câu 3 đúng ko bạn?

trust
telling
Under
which
be invited
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have
are taken
a
reading/watching

\(n_{C_2H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

PT: \(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)

Theo PT: \(n_{Br_2}=2n_{C_2H_2}=0,2\left(mol\right)\Rightarrow C_{M_{Br_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\)

→ Đáp án: C