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14 tháng 8 2017

X/ fill in each blank with one suitable word

- Lan's grandparents (1) ..live.........in Ben Tre. They spend their time (2).....looking.......after their vegetable garden. They (3)......grow??......because cabbages, lady's fingers, chillies and cucumbers. In fact, they (4)..plant.........more vegetables than they can eat so they (5)...often....give some to their neighbors. Lan (6)..visits..........her grandparents once a month. She enjoy helping in the (7).....working........graden. She waters the plants and (8)......cut.......out the weeds. "I always take (9)...away......some of grandpa's vegetables. (10).They.............are juicy and fresh ", says Lan

PTHH: \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

Ta có: \(\left\{{}\begin{matrix}m_{H_2SO_4}=588\cdot5\%=29,4\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\\n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,3}{3}\) \(\Rightarrow\) Al2O3 còn dư

\(\Rightarrow n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)=n_{Al_2O_3\left(dư\right)}\)

\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1\cdot342}{20,4+588-0,1\cdot102}\cdot100\%\approx5,72\%\)

20 tháng 6 2021

1 rivers

2 is 

3 much

4 down

5 lots

6 animals

7 on

8 not

9 there

10 in

20 tháng 6 2021

Thanks a lot !!!

21 tháng 10 2021

\(d,ĐK:x\ge1\\ PT\Leftrightarrow\sqrt{x-1}=2+\sqrt{x+1}\\ \Leftrightarrow x-1=2+x+1+4\sqrt{x+1}\\ \Leftrightarrow4\sqrt{x+1}=-4\Leftrightarrow x\in\varnothing\left(4\sqrt{x+1}\ge0\right)\\ g,ĐK:x\ge\dfrac{1}{2}\\ PT\Leftrightarrow x+\sqrt{2x-1}+x-\sqrt{2x-1}+2\sqrt{\left(x+\sqrt{2x-1}\right)\left(x-\sqrt{2x-1}\right)}=2\\ \Leftrightarrow2x+2\sqrt{x^2-2x+1}=2\\ \Leftrightarrow\sqrt{\left(x-1\right)^2}=\dfrac{2-2x}{2}=1-x\\ \Leftrightarrow\left|x-1\right|=1-x\\ \Leftrightarrow\left[{}\begin{matrix}x-1=1-x\left(x\ge1\right)\\x-1=x-1\left(x< 1\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\left(tm\right)\\x\in R\end{matrix}\right.\)

 

giúp mình với đang cần gấp xin cảm ơnI. Fill in the blanks with suitable relative pronouns/adyerb relatives3. The lady ………………… you met the party is a famous scientist.4. No one knows the city ………………… he was born except his father.5. Monday is the day ……………… we will come to school.6. The flowers ……………….. my friend gave me have died.7. Is he the doctor ……………….. we saw on TV last night ?8. The teacher with ……………… I studied last year no longer teaches in our school.9. The car ……………… John...
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giúp mình với đang cần gấp xin cảm ơn

I. Fill in the blanks with suitable relative pronouns/adyerb relatives

3. The lady ………………… you met the party is a famous scientist.

4. No one knows the city ………………… he was born except his father.

5. Monday is the day ……………… we will come to school.

6. The flowers ……………….. my friend gave me have died.

7. Is he the doctor ……………….. we saw on TV last night ?

8. The teacher with ……………… I studied last year no longer teaches in our school.

9. The car ……………… John used was very expensive.

10. English is the language ……………… is spoken all over the world.

11. Budapet, …………….. is on the Danube, is a beautiful city.

12. We don’t know the country ……………. the football game was first played.

13. The dress …………………………….. has the beautiful picture on belongs to my sister.

14. We have an aprtment …………………………….. oevrlooks the park.

15. He saw the man …………………………….. closed the door.

16. Is he the doctor …………………………….. we saw on TV last night ?

17. The student …………………………….. sits next to me me is from England.

16. The taxi driver …………………………….. took me to the aiport is friendly.

18. The student …………………………….. Mr. John introduced to me is very smart.

19. The lady ……………………………..  you met the party is a famous scientist

0
2 tháng 12 2021

Bài 3.

Định luật ll Niu-tơn:

\(\overrightarrow{F}+\overrightarrow{F_{ms}}=m\cdot\overrightarrow{a}\)

\(\Rightarrow F-F_{ms}=m\cdot a\)

Gia tốc vật:

\(a=\dfrac{F-F_{ms}}{m}=\dfrac{4,5-\mu mg}{m}=\dfrac{4,5-0,2\cdot1,5\cdot10}{1,5}=1\)m/s2

Vận tốc vật sau 2s:

\(v=a\cdot t=1\cdot2=2\)m/s

 Giúp mình với mn ơi :(VI. Fill in each numbered blank in the passage with ONE suitable word to complete its meaning.  Valentine is celebrated on…(1)…February 14. It is a festival of romantic love as many people give cards, letters, flowers or presents to their lover. They also may arrange a romantic…(2)…in a restaurant. People who would like to have a romantic relationship with somebody may use the occasion to make it known, often anonymously.Valentine’s day is not a public holiday....
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 Giúp mình với mn ơi :(

VI. Fill in each numbered blank in the passage with ONE suitable word to complete its meaning.  

Valentine is celebrated on…(1)…February 14. It is a festival of romantic love as many people give cards, letters, flowers or presents to their lover. They also may arrange a romantic…(2)…in a restaurant. People who would like to have a romantic relationship with somebody may use the occasion to make it known, often anonymously.

Valentine’s day is not a public holiday. Government offices, stores, schools and other organizations are…(3)…as usual. Public transit systems run on their regular…(4)…. Restaurants may be busier than usual as many people go…(5)…for an evening with their spouse or partner. Valentine’s day is also a very…(6)…date for weddings.

The most…(7)…Valentine’s day symbols are the heart, particularly in reds and pinks, and pictures or models of Cupid. Cupid is usually portrayed as a small winged figure with a bow and row. In mythology, he uses his arrow to strike the heart of people. People who have…(8)…in love are sometimes said to be struck by Cupid’s arrow.

1 +……………  2+ ………………..  3 + …………….           4 + …………….

5 +……………  6+ ………………..  7 + …………….           8 + …………….

1
26 tháng 2 2022

1. every

2. meal

3. open

4. schedule

5. out

6. popular

7. common

8. fallen

May là bài này vừa mới làm hum trước :)

26 tháng 2 2022

Cảm ơn ạ

24 tháng 12 2021

Bài 2: 

a: \(\Leftrightarrow4x^2-20x+25-4x^2+12x=0\)

=>-8x=-25

hay x=25/8

1. 

a) x (x - 5) + (x + 3)(x - 3)=

= x^2 - 5x + (x + 3)(x - 3)

= x^2 - 5x + x^2 - 9

= x^2 + x^2 - 5x - 9

= 2x^2 - 5x - 9.

b. không thể nhìn thấy hết bài được. Nó bị mất dấu!!

c. (20x^2 + 7x - 6) : (5x - 2)

= (5x - 2) (4x + 3) : (5x - 2)

= 4x + 3.

2. 

a. (2x - 5)^2 - 4x (x - 3)= 0

                       -8x + 25= 0

                -8x + 25 - 25= 0 - 25

                               -8x= -25

                          -8x : 8= -25 : 8

                                 x = 25/8

Vậy x= 25/8

b. 2(x - 5) - x^2 - 5x= 0

                        -10x= 0

              -10x : (-10)= 0 : (-10)

                              x= 0

Vậy x= 0

c. Lí do cũng giống câu b bài 1.

18 tháng 10 2021

Ha's house is small and it's in the country

18 tháng 10 2021

Ha's house is small and It's in the country