anh chị giúp em bài này nha. giới hạn 100-200 từ thôi ạ.
write about possible measures for protecting the environment
sáng mai em thi rồi. xin cảm ơn ạ.
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1. A. celebrate B. together C. restaurant D. organize
2. A. pollution B. awareness C. disappear D. addition
3. A. apple B. butter C. mother D. advance
4. A. protection B. referee C. dictation D. increasing
5. A. carriage B. damage C. survive D. lightning
6. A. generosity B. occurrence C. priority D. memorial
1. A. celebrate B. together C. restaurant D. organize
2. A. pollution B. awareness C. disappear D. addition
3. A. apple B. butter C. mother D. advance
4. A. protection B. referee C. dictation D. increasing
5. A. carriage B. damage C. survive D. lightning
6. A. generosity B. occurrence C. priority D. memorial
When there is breaking new about a typhoon, To be safe please do all this step for your live. First, plan with your parents about where to evacuate to, if you are outside, get inside your house now. Second, keep small outdoor objects, or light and sharp items from blowing away and may harming people. Third, if you are a kid or a child, ask your parent what you can do to help prepare your house. Finally, make sure to listen for safety and storm update. There simple four step can help you, remember that.
Câu 1:
Ta có 2x - y = 8 => 2x - y + 9 = 17
Mà 3x + y = 17 => 2x - y + 9 = 3x + y
<=> 9 - y = x + y <=> 9 = x + 2y <=> x = 9 - 2y
Mà 2x - y = 8 => 18 - 4y - y = 8 => 18 - 5y = 8 => y = 2 => x = 5
Bài `13`
\(a,\sqrt{27}+\sqrt{48}-\sqrt{108}-\sqrt{12}\\ =\sqrt{9\cdot3}+\sqrt{16\cdot3}-\sqrt{36\cdot3}-\sqrt{4\cdot3}\\ =3\sqrt{3}+4\sqrt{3}-6\sqrt{3}-2\sqrt{3}\\ =\left(3+4-6-2\right)\sqrt{3}\\ =-\sqrt{3}\\ b,\left(\sqrt{28}+\sqrt{12}-\sqrt{7}\right)\cdot\sqrt{7}+\sqrt{84}\\ =\left(\sqrt{4\cdot7}+\sqrt{4\cdot3}-\sqrt{7}\right)\cdot\sqrt{7}+\sqrt{4\cdot21}\\ =\left(2\sqrt{7}+2\sqrt{3}-\sqrt{7}\right)\cdot\sqrt{7}+2\sqrt{21}\\ =2\cdot7+2\sqrt{21}-7+2\sqrt{21}\\ =14+2\sqrt{21}-7+2\sqrt{21}\\ =7+4\sqrt{21}\)
A
9 km 26 m = 9,026 km
892mm = 0,892 mm
4m 783 mm = 47,83 dm
106 m = 1,06hm
8 dm 9 mm = 0,809m
Bài 2:
\(\dfrac{1}{2}:\dfrac{5}{4}=x:\dfrac{10}{3}\Leftrightarrow\dfrac{1}{2}.\dfrac{4}{5}=\dfrac{3}{10}x\Leftrightarrow\dfrac{3}{10}x=\dfrac{2}{5}\Leftrightarrow x=\dfrac{2}{5}:\dfrac{3}{10}=\dfrac{4}{3}\)
Bài 3:
Áp dụng t/c dtsbn:
\(\dfrac{x}{4}=\dfrac{y}{12}=\dfrac{x+y}{4+12}=\dfrac{48}{16}=3\)
\(\Rightarrow\left\{{}\begin{matrix}x=3.4=12\\y=3.12=36\end{matrix}\right.\)
- Khi dùng một chiếc kim nhọn châm vào thân thủy tức, xung thần kinh sẽ lan nhanh ra khắp mạng lưới thần kinh, làm cho thủy tức co toàn bộ cơ thể.
- Phản ứng của thủy tức là phản xạ vì thủy tức có tổ chức hộ thần kinh.
Protecting the environment is one of today’s most serious issues. It is not a secret that our planet is in danger! Almost every day we hear about a new problem affecting the environment. This list seems to be endless! The main issues are pollution, acid rain, greenhouse effect, climate change, rainforest destruction, and the extinction of thousands of animal and plant species. We are all aware of these concerns and can admit that we caused them. Most people really care about the future of our planet and realize it is time to improve the situation; otherwise, the environmental issues will become worse, with each of us suffering the negative consequences. It all seems to be really depressing but each of us, no matter what our age group, can do something to slow down the destructive processes and reduce the potential harm. We have to learn to be environmentally friendly in using natural resources like water, air, forests, agriculture, and wildlife without damaging them. It is very important to preserve the natural resources we have today so that future generations can also use them. Here are some examples of the problems we face today and the possible solutions for addressing them.
The fact is people produce too much rubbish. Household waste increased by 16% from 1992 to 2008. Each year, we produce half a ton per person. The main part of the rubbish is either burned or taken to enormous landfill sites. We should admit that both ways are harmful for the environment. The better option when dealing with waste is reusing or recycling it, rather than trying to find where to put it! Today, we recycle only 35% of our household rubbish, although it is possible to recycle up to 80%! To help achieve this, follow these simple recommendations:
Another serious threat to the environment is pollution. The air we breathe is polluted in many ways. It affects the lives of everyone. Air is damaged by car fumes and power stations and factories that cause acid rains, which destroy forests and lakes. Besides that, oil spills often pollute seawater and kill marine life. All these factors lead to spreading disease and damaging people’s health in many countries.
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