Bài 1: Tính hợp lí a) |-525|-(-635) -475-(525+635) b) 15.(-24)+(-24).84-24 c) 27.(-16)+(-16).74+16 Bài 2: Tìm x a) 2(x+4)-16=98+x b) (6x-18) ( 4x-24)=0 c) (5x+45) (7-x)-1=-1

Tìm số nguyên x để phân số sau là số nguyên: 2x+3/3x+2 Giải hộ mik với mik đang cần gấp lắm nếu bạn nào trả lời nhanh nhất mik sẽ vote 5 sao và cho câu trả lời hay nhất

Giải chi tiết nha, mình đăng 2 lần rùi đó, làm ơn mà, help me

Cho x = -98 , a = 61 , m = -25 . Tính giá trị các biểu thức sau : 1 , x+8-x-22 2 , -x-a+12+a 3 , a-m+7-8+m 4 , m-24+x+24-x

Đốt cháy một hỗn hợp gồm H2 và cacbon oxit có khối lượng là 13,6 gam cần dùng hết 17,92 lít khí O2 (đkc). Biết rằng sản phẩm gồm CO2 và hơi nước. a) Viết phương trình hoá học b) Tính khối lượng mỗi khí trong hỗn hợp đầu c) Tính thành phần % về thể tích của hỗn hợp đầu.

Mn Giúp mik vs nhé. Mik cảm ơn trc nha

mình đang cần gấp!!!!!!!!!!!!!!!

Mn giải hộ e bài này với ạ Cho 16g hỗng hợp Fe và Mg tác dụng với dung dịch HCl thu đc 1l khí H2 ( đktc) tính khối lượng hỗn hợp muối thu đc

Choose the word whose stressed pattern is pronounced differently from the others. A: litter B: effect C: affect D: pollute 2 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. The Earth Day comes from the idea of a former US politician Gaylord Nelson. He was worried about the world pollution, and the health of plants and animals. In 1969, he decided that the world should have a special day to teach people about how to make environment better. His idea became popular and on 22 April 1970 the first Earth Day was celebrated. Since then, environmentalists have used the day to educate people about their roles in protecting our planet. Earth Day finally became a global celebration around the world. On this day, people come together to talk about global warming, protecting rare animals and saving energy sources. Question 20: Environmentalists have used the Earth Day to ________. A: ban people from using energy sources B: carry their research C: educate people about their roles of protecting our planet D: get people around the world to play together 3 Choose the best answer A, B, C or D to complete the sentence. Question 10: Too much use of electric lights in cities may cause ___________ pollution. A: light B: water C: visual D: thermal 4 Choose the best answer A, B, C or D to complete the sentence. Question 12: The polluted water__________ in the death of the fish. A: results B: leads C: causes D: makes 5 Choose the best answer A, B, C or D to complete the sentence. Question 7: I think the waste from the factory has ___________ the lake. A: polluted B: damage C: damaged D: pollution 6 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. The Earth Day comes from the idea of a former US politician Gaylord Nelson. He was worried about the world pollution, and the health of plants and animals. In 1969, he decided that the world should have a special day to teach people about how to make environment better. His idea became popular and on 22 April 1970 the first Earth Day was celebrated. Since then, environmentalists have used the day to educate people about their roles in protecting our planet. Earth Day finally became a global celebration around the world. On this day, people come together to talk about global warming, protecting rare animals and saving energy sources. Question 18: According to the passage, Gaylord Nelson was ______. A: trying to pollute the environment B: not concerned about global warming C: unaware of the world pollution D: worried about the environment 7 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions. The Earth Day comes from the idea of a former US politician Gaylord Nelson. He was worried about the world pollution, and the health of plants and animals. In 1969, he decided that the world should have a special day to teach people about how to make environment better. His idea became popular and on 22 April 1970 the first Earth Day was celebrated. Since then, environmentalists have used the day to educate people about their roles in protecting our planet. Earth Day finally became a global celebration around the world. On this day, people come together to talk about global warming, protecting rare animals and saving energy sources. Question 21: The best title for the passage can be ______. A: The celebration of Earth Day B: Gaylord Nelson, the politician C: The meaning of the Earth Day D: Preserving our energy sources

Bài 83 nha. .