Nêu cách điều chế NaOH, Mg(OH)2 từ nhiều loại chất khác nhau và chỉ bằng 1 phản ứng. Giúp mình với ạ huhu

Mn ơi giúp mk bài này với . Giải chi tiết giùm với ak . Nếu được thì ghi công thức bạn dùng giùm mk nhé . Cảm ơn nhiều Tính đạo hàm : y = x / căn a ^2 - x ^ 2 ( a là hằng số )

100+100+99+100-100 mình làm giúp em

`(a+b+c)(a-b)(a-c)(b-c)` rút gọn

Tìm các nghiệm của pt sin(2x - 40 độ) = √3/2 với -180độ ≤ x ≤ 180 độ

mot san vạn dong hinh chu nhat duoc ve the ti le la 1:3000 kích thuoc la chieu dai 6cm chieu rong 3cm tinh dien tich

So sánh số hữu tỉ : a, x = 1/-2 và y = -1/3 b, x = -2/3 và y = 0 c, x = -0,125 và y = 1/-8 Giúp mình với ạ ><

I.Fill in the blank with Although /Despite/In spite of: 1. …………….. she is beautiful, everybody hates her. 2. ……………..earning a low salary, Sara helped her parents 3. Anna did not do well in the exam …………….. working very hard. 4. Lisa never talked to him …………….. she loved him. 5. …………….. I was very hungry, I couldn’t eat. 6. …………….. it was cold, Marie didn’t put on her coat. 7. …………….. the weather was bad, we had a good time. 8. Hung did the work …………….. being ill. 9. She refused the job …………….. the low salary. 10. He runs fast …………….. his old age.

Bài 1. Choose the word that has the underlined part pronounced differently 1.A. nose ;B. cold; C. vollunteer 2.A. time;B.kid;C. smile 3.A. lovely;B.postcard;C. old 4.A.creature;B. great;C. feature 5.A. design;B. musical;C. Africa 6.A. australia;B. Asia;C. award

VI. Write the correct form or tense of the verbs in brackets. 1. At present, the social networks ______________ (become) more popular among young generation. 2. I ______________ (not listen) to their new CD yet. Is it any good? 3. When I was a student, I ______________ (not like) doing homework. 4. Facebook ______________ (found) in 2004 by Mark Zuckerberg and Eduardo Saverin. 5. The American ______________ (spend) 34 hours a week watching television. 6. ______________ (you/ ever/ make) origami cranes? 7. I’ve just bought a new CD of folk songs. I ______________ (listen) to it tonight. 8. Do you adore ______________ (lie) in a hot bath? 9. Please try ______________ (arrive) punctually at 8.30. 10. Many teenagers prefer ______________ (watch) TV to ______________ (read) books.