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Lưu ý đây ko phải toán lớp 1 :

\(\frac{3}{4}\)ha = 7500 m2

\(2\frac{1}{4}\)ha = 22 500 m2

28 tháng 11 2016

Nowadays, our natural environment is suffering more and more the terrible human impact. At the moment, there are a lot of environmental problems, like desforestation, the destruction of the ozone layer, acid rain, the greenhouse effect, pollution in the air with traffic humes, and harmful chemicals which are released into the atmosphere, pollution in the rivers and oceans with illegal effluents, sewage spills, industrial waste, drinking water is being contamined due to river pollution…. (and so on)….

All this take parts of a terrible situation and involves awful drawbacks in our planet. The destruction of the rainforest carries many animals are wiped out, fish supplies are depleted through overfishing, pollution is very harmful for us, besides, there are methods of electricity generation (which emit greenhouse gases), and contribute to global warming.

Our governments have to improve their natural measures. It is important to support alternative source of power, like solar stations, wind power… These one should be easy to live and work with, safe, practical, cheap and clean. On top of that, they are higly productive and friendly with the planet. Besides, our goverments should have stricker laws and hard punishments for illegal hunting, encourage countries to control the number of trees are cut down, reduce gases emitted from factories (and so on)…

On the other hand, we all have to be aware about this problem, and contribute to conserve our planet, like: switch off the lights, ride a bicycle, insulate our houses, use public transport, use less petrol and electricity, save on water, recycle our rubbish ….. In this way, we all can contribute to conservate our environment and wildlife.

Our environment affects all of us. We share the same planet. We all have to be aware of the necessity of improve our natural world. The environmental organizations play an important role, but we all can do a little effort in being much more ecological.

8 tháng 9 2021

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8 tháng 9 2021

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20 tháng 9 2021

13 B

14 B

15 C

27 tháng 6 2019

cái đề đâu bn

17 tháng 10 2021

1. Đ

2. S

3.Đ

bạn ơi còn 4,5,6 nx giúp mik vs

 

20 tháng 9 2021

1 It took him 2 hours to cook dinner

2 He has learnt English since he was 6 years old

12 tháng 3 2022

nãy mik lm r bn xem lại nhé

12 tháng 3 2022

Cảm ơn bạn nha

23 tháng 3 2022

\(\dfrac{4x}{3}=\dfrac{-8}{9}\)

\(4x=\dfrac{\left(-8\cdot3\right)}{9}\)

\(4x=-\dfrac{24}{9}\)

 \(x=-\dfrac{24}{9}\div4\)

 \(x=-\dfrac{24}{36}\)

 \(x=-\dfrac{2}{3}\)