Complete the sentences about types of pollution
water ; water ; noise ; thermal ; land ; light ; air
1. _______ pollution happens when rivers, lakes and oceans are contaminated with harmful substances.
2._______ pollution makes the quality of the land worse.
3. _______ pollution happens when dust, smoke or gases go into the air and are harmful to humans, animals
and plants.
4. _______ pollution results in stress and hearing loss.
5. _______ pollution causes the death of water animals.
6. _______ pollution happens when your outdoor lights affect the comfort and health your neighbours.
7. _______ pollution changes the temperature of a lake, a river or an ocean.
 

Kết quả phân tích đa thức a(a – b) – a + b thành nhân tử là:

Kết quả phép tính nhân (2x+1).(x-3) là

Giá trị của biểu thức: x(x + 1) – y(x + 1) tại x = 2021 và

y = 2022 bằng
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