Hỗn hợp A có khối lượng 6,1g gồm CuO, Al2O3 và FeO. Hòa tan hoàn toàn A cần 130ml dung dịch H2SO4 loãng 1M, thu được dung dịch B. Cho dung dịch B tác dụng với dung dịch NaOH dư, lọc lấy kết tủa đen nung trongkhông khí đến khối lượng không đổi, được 3,2g chất rắn. Tính khối lượng từng oxit trong A

Tìm x: a) (x-3)^3 -(x-3) .(x^2 +3x +9)+ 9(x+1)^2 =15 b) x(x-5)(x+5)-(x+2)(x^2 -2x+4) =3 Xinloi vì sự lười biếng này :( Nhân tiện dịch giùm toii câu : Cho toii một chuts hy vọng được hong ? Cảm ơn trc awwwwwwwwwwwwww =)))

giúp mình với em hãy viết bài văn miêu tả một sáng mùa hè * LƯU Ý KHÔNG COPY MẠNG nhé

Hứa trả 5 sao, 1 cảm ơn và 1 câu trả lời hay nhất Làm nhanh giúp mình với ạ

Mm giúp mk vs mk sẽ đánh giá 5 sao

VI. Choose the correct sentence from the four options a, b, c or d 31 The reporter/ wanted/ know/ why/ I/ not/ taken/ a picture/ when/ I/ had seen. the UFO. a. The reporter wanted know why I hadn’t taken a picture when I had seen the UFO. b. The reporter wanted know why I didn’t taken a picture when I had seen the UFO. c. The reporter wanted to know why I hadn’t taken a picture when I had seen the UFO. d. The reporter wanted to know why I didn’t taken a picture when I had seen the UFO. 32 Do/ you/ think/ astronauts/ feel/ great sense/ loneliness/ when/ travel/ alone/ space? a. Do you think astronauts feel great sense of loneliness when traveling alone in space? b. Do you think astronauts feel great sense of loneliness when travel alone in space? c. Do you think astronauts feel a great sense of loneliness when travel alone in space? d. Do you think astronauts feel a great sense of loneliness when traveling alone in space? 33 About 95%/ the atmosphere/ on Mars/ be/ carbon dioxide, which/ be/ poisonous/ breath a. About 95% of the atmosphere on Mars is carbon dioxide, which is poisonous to breath. b. About 95% on the atmosphere on Mars is carbon dioxide, which is poisonous breath. c. About 95% on the atmosphere on Mars is carbon dioxide, which is poisonous to breath. d. About 95% of the atmosphere on Mars is carbon dioxide, which is poisonous breath. 34 In the film, John Harrison/ be/ space terrorist/ who/ want/ destroy/ the Earth. a. In the film, John Harrison is a space terrorist who wants destroy the Earth. b. In the film, John Harrison is space terrorist who wants to destroy the Earth. c. In the film, John Harrison is a space terrorist who wants to destroy the Earth. d. In the film, John Harrison is space terrorist who wants destroy the Earth. 35 The/ biggest problem/ for/ humans/ live/ other planets/ be/ lack/ atmosphere and water. a. The biggest problem for humans to live in other planets is lack of atmosphere and water. b. The biggest problem for humans living on other planets is lack of atmosphere and water. c. The biggest problem for humans to living in other planets is lack of atmosphere and water. d. The biggest problem for humans to live on other planets is lack of atmosphere and water. 36 The/ with/ Moon/ a/ plains/ was/ mountains/ like/ and/ valleys/ desert/. a. The Moon was like a desert with plains, mountains, and valleys. b. The Moon was a desert like with plains, mountains, and valleys. c. The Moon like was a desert with plains, mountains, and valleys. d. The Moon was like with a desert plains, mountains, and valleys. 37 Do/ 88 Earth days/ you/ it/ for/ Mercury/ that/ takes/ the Sun/ orbit/ once/ to? a. Do you know that it takes 88 Earth days for Mercury to orbit the Sun once? b. Do you know that 88 Earth days takes it for Mercury to orbit the Sun once? c. Do you know that Mercury takes 88 Earth days for it to orbit the Sun once? d. Do you know that it takes to orbit 88 Earth days for Mercury the Sun once? 38 Jupiter/ in/ largest/ is/ solar/ the/ system/ the/ planet. a. Jupiter is the planet largest in the solar system. b. Jupiter is the largest planet in the solar system. c. Jupiter is the largest solar planet in the system. d. Jupiter is the largest system planet in the solar. 39 NASA/ launch/ decided/ Cape Canaveral/ end/ at/ from/ of/ the/ a rocket/ this year. a. NASA decided launch to a rocket from Cape Canaveral at the end of this year. b. NASA decided launch from a rocket to Cape Canaveral at the end of this year. c. NASA decided to launch a rocket at from Cape Canaveral the end of this year. d. NASA decided to launch a rocket from Cape Canaveral at the end of this year. 40 They/ to/ are/ a/ that/ accommodate/ could/ the/ planet/ attempting/ find/ Earth’s population. a. They are attempting to find a planet that could accommodate the Earth’s population. b. They are to find attempting a planet that could accommodate the Earth’s population. c. They are attempting to accommodate a planet that could find the Earth’s population. d. They are attempting to find a population that could accommodate the Earth’s planet.

Tại điểm A, B cách nhau 20 cm trong không khí có đặt lần lượt 2 điện tích q1=-9.10^-6, q2=4.10^-6. a) Xác định cường độ điện trường do 2 điện tích này gây ra tại C biết AC = 15cm BC = 5cm b) Xác định vị trí điểm M mà tại đó cường độ điện trường tổng hợp do 2 điện tích gây ra bằng 0

2/3 + 2/15 + 2/35 + 2/63 + 2/99 =?

Phân loại các từ ghép sau đây thành từ ghép chính phủ hay từ ghép đẳng lập: nảy nở, tươi cười, cá mú, áo dài, cà chua, xanh biếc, học tập, bút mực, thầy cô, túp lều. làm ăn, quạt giấy.

V. Rewrite the sentences so that they are nearest in meaning to the sentence printed before them. 26 Dr. Nelson: The heat from its sun made Kepler-452b lose its oceans. Dr. Nelson said 27 Mai: How old is Kepler-452b - the Earth's cousin? Mai asked 28 Nick: The recycling system of the ISS supply 4 liters of water a day. Nick said 29 Duong: How can the astronauts wash their hair, Mi? Duong asked Mi 30 Mi: They use no-rinse shampoo and a towel to wash their hair. Mi said