a) (-26) + (-32)   b) 57 + 264   c) (-267) + (-473)   d) (-5) +8

=-(26 + 32)         =321             =-(267 + 473)         =8-5

=-58                                        =-740                     =3

e) 1000 + (-327)    f) (-5679) + 5679   g) (-2364) + (-175)

=1000-327             =0                          =- (2364 + 175)

=673                                                    =-2539

h) 136 + (-36)

=136 - 36

=100

Has -  of - much - on - for - there - with - am - the - Is - your

in-every nhé

in-at

in his/at the

Tham Khảo về ô nhiễm nước

Water pollution is among one of the most concerning problem facing the world today. There are some causes of water pollution. The first reason is the daily activities of everyone when somebody disposes the waste in wrong places. Besides, the the operation of the plant also pollutes the water, because industrial waste water has not been treated. Moreover, increasing population is creating many issues but it also plays negative role in polluting the water. It leads to increase in solid waste generation, which is discharged in to rivers. These actions are ideal conditions for bacterial, viral and parasitic diseases. They are spreading through polluted water and affecting human health. To solve the problems, there should be proper waste disposal system and waste should be treated before entering in to river. Educational and awareness programs should be organized to control the pollution.

Tham khảo ô nhiễm không khí

Nowadays, big cities are facing with air pollution, one of the most serious global issues. One of the causes is vehicular traffic. The combustion of the automobile fuel whether it is diesel or petrol, that powers a vehicle, leads to the release of poisonous gases released through the exhaust of the vehicle. Smoke generated by factories is also let out into the air leading to pollution. Moreover, the burning of fossil fuels such as coal, as also the burning of wood for cooking, and of farm wastes lead to harmful smoke polluting the air. Air pollution always has bad effects on our life. People around the world are suffering from respiratory and cardiac problems, and diseases such as cancer affecting other organs of the body too. To improve the air quality, people should plant more trees and use pubic transports instead of private vehicles.

Tham khảo ô nhiễm đất

Soil plays an important role in our life because it is the component where the sources of life like water and sunlight air come together. The pollution of this precious element has now turned into a global problem and not the only country’s concern. Soil pollution can be defined as the increase of persistent toxic elements in the soil like the presence of chemicals, salts, disease-causing agents, radioactive wastes, or anything that changes the soil’s quality and causes an adverse effect in the growth of the plant and on human health. Soil pollution can be reduced by proper regulated waste dumping and by avoiding littering, reduced use and throwing of toxic material, recycling of waste materials, decreasing the use of toxic fertilizers, pesticides, insecticides, and instead opting for organic products, stop deforestation by growing more plants (reforestation). It is our role as students to understand the importance of preserving the purity in soil and saving it from contamination by educating others on the matter through the spreading of awareness.

Tham Khảo:

-Vấn đề đặt ra trong việc phát triển du lịch của các nước Nam Âu 

+Bảo vệ nguồn tài nguyên du lịch phong phú và đặc sắc

+Đảm bảo giữ nguyên các di tích lịch sử, công trình kiến trúc , văn hoá, nghê thuật cổ đại

+Sử dụng các biển pháp để bảo vệ môi trường biển

TK:

Bảo vệ nguồn tài nguyên du lịch phong phú và đặc sắc

Đảm bảo giữ nguyên các di tích lịch sử, công trình kiến trúc , văn hoá, nghê thuật cổ đại

Sử dụng các biển pháp để bảo vệ môi trường biển

_HT_