Đoàn thứ nhất chở số kg  là:

150 x 4 = 600(kg)

Đoàn thứ hai chở số kg là :

240 x 5 = 1200(kg)

Tổng số kg là:

1200 + 600 = 1800 (kg)

Đ/s: 1800 (kg)

Tổng số học sinh của lớp là:

18+12=30 (học sinh)

số học sinh nữ chiếm số phần của lớp là

12/30

were

 100km= 100 000 00 cm

i 50km= 50 00 000cm

Quãng đường CD được thu nhỏ là:

50 00 000 : 2500 000=2(cm)

Quãng đường AB được thu nhỏ là

100 000 00: 500000= 2(cm)

Vậy độ dài quãng đường AB thu nhỏ bằng độ dài quãng đường CD thu nhỏ

TK

Quang trung đại phá quân thanh nối với năm 1789

Lê lợi lên ngôi hoàng đế nối với năm 1428

Nguyễn ánh lật đổ triều tây sơn nối với năm 1802

Khởi nghĩa tây sơn nối với năm 1789

Những phong tục của người Việt trong thời Bắc thuộc vẫn được duy trì đến ngày nay là: + Tục ăn trầu. + Tục làm bánh chưng, bánh giày trong các dịp lễ tết. + Tín ngưỡng thờ cúng tổ tiên; thờ cúng anh hùng dân tộc.

cả 2 đều đúng nhé,chỉ khác cách viết thôi bn 

A

Would you like to visit Ha Long Bay?

Air pollution exposes people to fine particles in polluted air. These fine particles penetrate deep into the lungs and cardiovascular system, causing strokes, heart disease, lung cancer, chronic obstructive pulmonary disease and respiratory infections.

 
Industry, transportation and coal-fired power plants along with the use of solid fuels are the major sources of air pollution. Air pollution continues to increase at an alarming rate and affects economies and people's quality of life.

Air pollution threatens the health of people everywhere in the world. Recent estimates in 2018 show that 9 out of 10 people breathe air containing high levels of pollutants. Air pollution both outdoors and indoors causes about 7 million deaths annually globally; In the Western Pacific region alone, about 2.2 million people die each year. In Vietnam, about 60,000 deaths each year are related to air pollution.

In addition to outside air pollution, air pollution from household smoke is a huge health risk for the 3 billion people who cook and heat their homes with biomass fuels and coal. . About 3.8 million premature deaths can be attributed to household air pollution in 2016. Most of the burden of this disease rests on developing countries. Household air pollution is also a major source of outdoor air pollution in both urban and rural areas.

Both urban and rural areas were estimated to cause 4.2 million premature deaths globally each year in 2016; This mortality is due to exposure to fine solid particles with diameters equal to or less than 2.5 micrometers, which cause cardiovascular disease, respiratory disease and cancer. It can be seen that air pollution is increasingly adversely affecting human life in many ways. Therefore, it is necessary to come up with optimal solutions to protect our green planet before it is too late.

 
Therefore, from now on, we need to take strong measures to improve people's consciousness, renovate nature and minimize the amount of waste and emissions because protecting the environment is protecting the environment. our own lives. We need to ring the alarm bell to wake everyone up, we need to join hands to protect the environment.