a, tính trung bình cộng
__
X= 3.1+4.3+5.4+6.7+7.8+8.9+9.8+10.5+11.3+12.2
______________________________________________________ =7,68
50
b, Mo=8 (Mo kí hiệu của mốt)
a) Số trung bình cộng là :
X = $\frac{3.1+4.3+5.4+6.7+7.8+8.9+9.8+10.5+11.3+12.2}{50}$ = 7,68 ≈ 7,7
b) Mo=8
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. .
F= (-3 phần 2 )^2 + giá trị tuyệt đối -5 phần 6 - hỗn số 1 1 phần 2 / 6
một vật làm bằng sắt có trọng lượng 15,6N a.tính khối lượng của vật đó b.tính thể tích của vật đó(biết khối lượng riêng của vật đó là D=7800kg/m3
Nhưng bạn trong đội văn mà học giỏi chuyên làm văn hay giúp mình bài này nhé !! các bạn làm dài và hay nữa ạ mk sẽ vote cho nhiều sao ạ
Cho 20 gam hỗn hợp NaOH và Na2 CO3 tác dụng với dung dịch HCl (dư) thì thấy thoát ra 2,24 lít khí (đktc). Tính phần trăm khối lượng của Na2 CO3 trong hỗn hợp ban đầu A: 10,6%. B: 0,53%. C: 50% D: 53%.
[(2/3x)-(2/x+1)-(2x^2)/(8-4x+2x^2-x^3)]:(x-1/x)=2x/x-1
làm giúp em phần a bài này vs ạ Em cảm ơn nhiều ạ
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