7 tấn 9 kg = ... tấn

Hòa tan hoàn toàn 16,6 g hỗn hợp gồm Na và Ca vào H2O thu được 8,96l khí H2 (đktc)

a) Tính khối lượng từng kim loại trong hỗn hợp ban đầu

b) Tính khối lượng các bazơ tạo thành

Trong mặt phẳng tọa  độ Oxy cho điểm A(-4;-3); B(-2;1). Viết phương trình chính tắc đường tròn đường kính AB

Cho cosx= -4/5,pi/2 < x < pi  , Tính  sinx, tanx

cho góc xOy =60 độ .Trên 2 tia Ox,Oy lần lượt lấy hai điểm A,B .Vẽ các tia Az và Bz' ở trong góc xOy sao cho OAz =Obz'=150độ .Chứng minh rằng Az//Bz'.

describe a time you were not allowed to use your mobile phone (7-8 câu)

${\mathrm{a}}^2$-$\sqrt{a}$

Phân tích đa thức thành nhân tử

Cho tam giác ABC vuông tại A, đường cao AH. Gọi AD là tia phân giác của góc HAC. Biết BC=5cm; HD=1,2cm. Tính các cạnh còn lại của tam giác
 

Complete the email to give your Australian pen friend some information about a short trip in Hue, using the sentences (A-G) given.
A. After your stay at Thanh Tien, we will continue on our cycle ride through the local paddy fields and
pastures.
B. The artisans are delighted to show you this craft of creating prints in an age-old style.
C. You can complete the trip with a car journey back to Hue and to your hotel.
D. First, you can get on a boat to enjoy a gentle cruise downstream to visit the Sinh Handicraft Village.
E. This village is famous for its handcrafted paper flowers especially the traditional flower of Vietnam,
the Lotus.
Love English heart and soul
Dear Ann,
For a half-day trip in Hue, you should go to the outskirts of Hue to visit the villages of Thanh Tien and Sinh.
(1)
_______________________________________________________________________________________.
_______________________________________________________________________________________.
You will go past the Dong Ba Market located by the Hen islet and arrive at the Sinh Handicraft Village where
you will greeted by the local artisans. (2) ______________________________________________________.
You will be invited create a print of your own Chinese Horoscope sign.
Then we take our cycles to visit the neighboring village of Thanh Tien. (3) ___________________________.
These flowers are just beautiful and made with such care and precision.
(4)_____________________________________________________________________________________.
You can enjoy the beauty of the local scenery and see locals going about their daily activities of rice cultivation
and flower gardening. (5)___________________________________________________________________.
Look forward to seeing you soon!
Best wishes,
Mi

Write an email to your pen friend about a trip to craft villages around Hoi An, using the words or
phrases below to make complete sentences. Add more words, if necessary.
Dear David,
1. You/ start/ trip/ taking/ short walk down/ harbor/ Hoi An/ where/ you/ board/ wooden boat.
______________________________________________________________________________________
2. First/ you/ get/ pottery Thanh Ha village/ where/ local people/ continue/ make/ craft pots/ hand.
______________________________________________________________________________________
3. Then/ you/ continue/ visit/ carpentry village/ Kim Bong/ which/ have/ huge influence/ architecture/ Hoi An.
______________________________________________________________________________________
4. The traditional carpentry/ keep/ alive/ and/ still used/ restoring/ old buildings/ Hoi An.
______________________________________________________________________________________
5. Your trip/ finish/ boat trip/ back/ ancient town/ Hoi An.
______________________________________________________________________________________
Look forward to seeing you soon!
Best wishes,
Anna.

$$\begin{gathered} 1.\sqrt{3^4{(-8)}^{2 }} \\ 2.\sqrt{1,6}\times \sqrt{250}\times \sqrt{19,6}\times \sqrt{10} \end{gathered}$$

Cho P = $\frac{a^2+b^2}{b}$. Biết a - b = 1, tìm Min P.