1. In the first picture, the man has a big dog but In the second picture, he is  has a puppy.

2. In the first picture, the clock is showing quarter past three but In the second picture , it's showing quarter to three.

3. In the first picture, the woman is go to the post office but In the second picture the woman came out of the library.

4. In the first picture, the bus is has a window but In the second picture the bus isn't has a window.

5. In the first picture, the girl is sitting on the chair but In the second picture, she is running.

6. In the first picture, the sky has a sun but In the second picture, it isn't has a sun.

7. In the first picture, the boy is thinking a bread but In the second picture, he's thinking a glass of water.

8. In the first picture, behind many houses it's a castle but In the second picture, behind many houses it's a bridge.

1. across : băng qua

2. turn right : rẽ phải

3. turn left : rẽ trái

4.straight on : đi thẳng

5. go pass : đi qua

6. go along : đi dọc theo

7. at the corner of : tại góc

Bài 3. 

$3(-4x^2y^2)y=3(-4).x^2y^2.y=-12x^2y^{2+1}=-12x^2y^3$

Đáp án C

Bài 4. 

$(-2xy^3).(-4x^2y)=(-2).(-4).x.x^2.y^3.y=8x^3y^4$

 $-2xy(-4x^2y^2)=(-2)(-4).x.x^2.y.y^2=8x^3y^3$ nên đơn thức A không đồng dạng với đơn thức ban đầu.

$x^2y(-8x^2y^2)=-8x^4y^3$ nên đơn thức D không đồng dạng với đơn thức ban đầu. 

Bài 19:

Ta thấy:

$6^2+8^2=10^2$

$\Leftrightarrow BC^2+AB^2=AC^2$ nên theo định lý Pitago đảo thì tam giác $ABC$ vuông tại $B$

$\Rightarrow \widehat{B}=90^0$

a: M=2x^3-x^3+5x^2-3x^2+1-2

=x^3+2x^2-1

b: Bậc là 3

c: Khi x=2 thì M=2^3+2*2^2-1=15

e tham khảo link này nhé 

10 DE DAP AN THI HSG ANH 7 - Lib24.Vn

mà paragraph của e là viết văn à

thầy cô đã dạy em cách để viết 1 paragraph chưa? 

nếu chưa thì em thử vào mục hỏi đáp, tiếng anh, câu hỏi hay, anh nhớ cô Violet đã từng hướng dẫn cách viết đoạn í

Đầu tiên em phải viết đúng trước mới viết hay nhé

"Hearts":

people's hearts

Bài 1:

(1) \(4Al+3O_2\xrightarrow[]{t^o}2Al_2O_3\)

(2) \(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)

(3) \(AlCl_3+3KOH\rightarrow3KCl+Al\left(OH\right)_3\downarrow\)

(4) \(Al\left(OH\right)_3+3HCl\rightarrow AlCl_3+3H_2O\)

(5) \(2Al\left(OH\right)_3\xrightarrow[]{t^o}Al_2O_3+3H_2O\)

(6) \(Al\left(OH\right)_3+NaOH\rightarrow NaAlO_2+2H_2O\)

(7) \(Al_2O_3+2NaOH\rightarrow2NaAlO_2+H_2O\)

(8) \(Al+NaOH+H_2O\rightarrow NaAlO_2+\dfrac{3}{2}H_2\uparrow\)

(9) \(2Al_2O_3\xrightarrow[criolit]{đpnc}4Al+3O_2\)

Bài 2:

PTHH: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)

              a_______a_______a_____a    (mol)

            \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)

                b_______b________b____b     (mol)

Ta lập HPT: \(\left\{{}\begin{matrix}56a+24b=21,6\\a+b=\dfrac{11,2}{22,4}=0,5\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,3\\b=0,2\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,3\cdot56}{21,6}\cdot100\%\approx77,78\%\\\%m_{Mg}=22,22\%\end{matrix}\right.\)

Bảo toàn nguyên tố: \(\left\{{}\begin{matrix}n_{Mg\left(OH\right)_2}=n_{Mg}=0,2\left(mol\right)\\n_{Fe\left(OH\right)_2}=n_{Fe}=0,3\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow m_{kết.tủa}=m_{Fe\left(OH\right)_3}+m_{Mg\left(OH\right)_2}=0,3\cdot107+0,2\cdot56=43,3\left(g\right)\)

Theo các PTHH: \(n_{H_2SO_4\left(p/ứ\right)}=0,5\left(mol\right)\) \(\Rightarrow n_{H_2SO_4\left(ban.đầu\right)}=0,5\cdot120\%=0,6\left(mol\right)\)

\(\Rightarrow m_{ddH_2SO_4}=\dfrac{0,6\cdot98}{10\%}=588\left(g\right)\)

Bảo toàn nguyên tố: \(\left\{{}\begin{matrix}n_{MgO}=n_{Mg}=0,2\left(mol\right)\\n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe}=0,15\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow m_{chất.rắn}=m_{MgO}+m_{Fe_2O_3}=0,2\cdot40+0,15\cdot160=32\left(g\right)\)

Bài 1: Hoàn thành các câu dưới đây bằng cách chia đúng các động từ trong ngoặc

1/ I (buy) …………..this red car in the next year.

2/ I often (have) …………..breakfast at 7.30 o’clock

3/ Her brother(not / like) …………………Orange Juice

4/ My father (drive)…………..to work daily

5/ My dog (can swim)………...very good

6/ Lan (forget)…………story at Phong’s home

7/ I (do)……………. it for you in the next day

8/ If it is sunny, she (go) …………the park

9/ I think she (come)……………back late in this evening

10/ My mother (call)……………..you in the 5 minutes.

Bài 2: Viết lại các câu dưới đây:

1/ I / my / homework / finished / last night /

2/ help/ you / please/ me/ take / a photo

3/ She / had / fun / yesterday

4/ If/ she / exam / her/ mother / passes/ give / her / cake / will/ the/ a/

5/ you/ hungry / because/ I/ bring / a / cake/ are

Bài 3: Đọc đoạn văn sau và trả lời câu hỏi phía dưới

Hanh and Hoa live in Ho Chi Minh city, Vietnam. They have a apartment on Pham Ngoc Thach road. There are 2 bedrooms, one bathroom and one kitchen room. Hanh and Hoa have two children: a boy and a girl. Hanh works in a hospital and his wife is a worker. They usually leave home at eight o'clock. Hanh drives to school with his two children. Then he drives to works at the hospital. In the evening, Hoa always cooks dinner. After dinner, they sometimes watch TV.

Q1. Where do they live? ……………………………………….

Q2. Do they have a house? ……………………………………….

Q3. What is Hoa’s job? ……………………………………….

Q4. What kind of traffic does Hanh go to? …………………………………………..

Q5. Who cooks for Hanh’s family? ………………………………………..

Bài 4: Cho đoạn văn sau, hoàn thành các từ còn thiếu để thành đoạn văn hoàn chỉnh

I live in ..(1)... house near the park. It is an....(2)... house, about 200 years old and very...(3)..... There is. (4)... living room, three bedrooms, one kitchen and one bathroom. Everyday, our family ....(5).. dinner together. My mother is a very good cook. She often changes dishes for family.

Bài 5: Chọn các từ phát âm khác với những từ còn lại

Bài 6: Viết các câu hỏi cho các câu trả lời sau

1. I'm from Hanoi, Vietnam? → …………………………………………?

2. I can bring an umbrella for you → ……………………………………..?

3. I live in Ho Chi Minh city→ ……………………………………………?

4. I like playing football & badminton → ……………………………………….?

5. I like Math and English → …………………………………?