Trình bày sự đa dạng của sinh học ở việt nam

\(x\cdot\left(x^2-3\right)-x^3+7=0\\ x^3-3x-x^3+7=0\\ -3x+7=0\\ -3x=-7\\ x=\dfrac{7}{3}\)

\(2Zn+O_2\rightarrow2ZnO\)

0,1        0,05      0,1

a) số mol của Zinc là:

\(n=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

khối lượng oxygen là:

\(n=\dfrac{V}{24,79}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)

lập tỉ lệ: \(\dfrac{n_{Zn}}{2}=\dfrac{0,1}{2}< \dfrac{n_{O_2}}{1}=\dfrac{0,2}{1}\) (O₂ dư tính theo Zn)

khối lượng O₂ trong đề là:

m = n.M = 0,2 x 32 = 6,4 (g)

khối lượng thực của O₂ là:

m = n.M = 0,05 x 32 = 1,6 (g)

khối lượng O₂ dư là :

6,4 - 1,6 = 4,8 (g)

b) khối lượng oxide tạo thành là:

m = n . M = 0,1 x 81 = 8,1 (g)

we love out door activities, but we spend too much time indoors

VII. Circle the correct word to complete the sentences.
1 Christmas          2 festival     3 cheese         4 throw            5 perform
6 Easter Bunny    7 twins         8 decorate    9 October          10 traditional
VIII. Complete the answers for the following Yes/ No questions
1 Yes, I do
2 No, we dont
3 Yes, she was
4 Yes, he did
5 No, we are not
6 Yes, he is
7 No, they were not
8 No, we did not 
9 No, you should not
10 Yes, you can
IX. Supply the correct form of the words in brackets.
1 festive                2 performances      3 amazing
4 traditional           5 beautiful              6 traditionally
7 celebrated          8 religious              9 parades
10 performances  11 cultural               12 celebrations

XV. Change the following sentences into Yes/ No questions.
1 Will they go to the music festival next week?
2 Should people behave well on the first day of the new year?
3 Is he singing a song about the beauty of his country?
4 Did she go online for more information about Diwali festival?
5 Is the Lantern Festival celebrated on the 15th day of the first lunar month?
6 Does the Lim festival take place every year?
7 Can we esign some posters to sell food at the Mid-Autumn Festival?
8 Does my mother usually cook special food at Tet?
9 Do thousands of fans travel to Belgium to attend Tomorrowland?
10 Is Tet usually celebrated between late January or early February?

1 People carve pumpkins and eat candy apples
2 On Halloween, children wear costumes and go trick or treating
3 Every year, thousands of people and visitors attend the festival
4 People give chocolate eggs to their family and friends
5 People believe that the lanterns will bring their wishes to the Gods
6 The dancers will perform folk dances at the festival
7 How many candy apples do you need for the Halloween party
8 The Rio Carnival takes place in Brazil every year

Dear ...
I hope this postcard finds you well! I just wanted to share some highlights from my holiday in [tên thành phố]. It has been an incredible experience exploring this vibrant city, filled with so much history and culture.
One of the first things that struck me about [tên thành phố] is its breathtaking architecture. From the majestic cathedrals to the charming cobblestone streets, every corner seems to have a story to tell. I've spent hours wandering around, admiring the stunning buildings and soaking in the atmosphere.
Of course, no visit to [tên thành phố] would be complete without indulging in the local cuisine. I've sampled everything from traditional street food to gourmet delicacies, and each meal has been a delight for the taste buds. The culinary scene here is truly unmatched!
In between exploring museums and art galleries, I've also made time to relax in some of the city's beautiful parks and gardens. There's something so peaceful about escaping the hustle and bustle and reconnecting with nature.
Overall, my holiday in [City Name] has been nothing short of magical. I've made memories that I'll cherish forever and can't wait to share more stories with you when I return.
Wishing you were here!
[tên]

Cho \(A=\dfrac{1}{3^2}+\dfrac{1}{4^2}+\dfrac{1}{5^2}+...+\dfrac{1}{99^2}+\dfrac{1}{100^2}\). So sánh A với \(\dfrac{1}{2}\)