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SL
17 tháng 8 2016
Gọi số tổ chia đc là a
Ta có:30 chia hết cho a
20 chia hết cho a
=>a thuộc ƯCLN(20,30)
20=2^2x5
30=2x3x5
ƯCLN(20,30)=2X5=10
Vậy chia đc nhìu nhất 10 tổ
Ta lại có : Ư(10)={1,2,5,10}
mà chia đc nhìu nhất 10 tổ nên=>30:10=3(hs nam)
20:10=2(hs nữ)
Vậy mỗi tổ có :Nam:3 hs
Nữ:2 hs
19 tháng 9 2021
\(B1:\)-Ta xát tổng của M
48 chia hết cho 4
20 chia hết cho 4
Ta áp dụng công thức a chia hết cho d;b chia hết cho d;c chia hết cho d
=>a+b+c chia hết cho d
=>Để m chia hết cho 4 thì a cũng phải chia hết cho 4
Để M không chia hết cho 4 thì a phải không chia hết cho 4
\(B2:\)1x2x3x4x5x...x20
=(5x20x4)x1x2x3x...
=400x1x2x3x...
Ta có 400 chia hết cho 400
Ta áp dụng công thức
a chia hết cho b thì a nhân với bất kì số nào cũng chia hết cho b
=>A chia hết cho 400
\(B3:\)Ta có n+10 chia hết cho n+1;n+1 chia hết cho n+1
=>(n+10)-(n+1) chia hết cho n+1
a,(n+10)-(n+1)=9
=>9 là bội của n+1
Ư(9)=(1;-1;3;-3;9;-9)
| n+1 | 1 | -1 | -3 | 3 | 9 | -9 | |
| n | 0 | -2 | -4 | 2 | 8 | -10 |
=.n=(0;-2;-4;2;8;-10
ND
3
10 tháng 11 2018
Ta có:
\(\frac{x+1}{x-7}=\frac{x-7+8}{x-7}=1+\frac{8}{x-7}\)
Để phân số trên là số tự nhiên thì: \(\frac{8}{x-7}\)là số tự nhiên
hay\(8⋮\left(x-7\right)\Rightarrow x-7\inƯ\left(8\right)\Rightarrow x-7\in\left(1;2;4;8\right)\)
\(\Rightarrow x\in\left(8;9;11;15\right)\)
Vậy................................ Chúc bn hok tốt !!
KC
11 tháng 7 2018
I have a friend named Snow Elementary. She must be eleven years old now. Remembering the elementary school she d the most was singing on the stage now she was a dream. The house is on the side of the street so few people can hear the laughter of the children. My family just had him and his mother died. My father died very sad because of the situation you are now every human being has a destiny. I wish I could help him. I just want to say to you "Please try hard"
bảng dịch
tôi có một người bạn thân tên là Tuyết Như hồi Tiểu học . Chắc bây giờ bạn ấy cũng được mười một tuổi rồi . Nhớ hồi Tiểu học bạn ấy thích nhất là được ca hát trên sân khấu bít bây giờ bạn ấy đã được như ước mơ . Nhà bạn ấy nằm bên ngõ đường nên rất ít người qua lại chỉ nghe tiếng cười của đám trẻ con . Gia đình bạn ấy chỉ có bạn ấy và mẹ bạn ấy cha bạn mất sớm tôi rất buồn vì hoàn cảnh của bạn bít sao giờ mỗi con người đều có một số phận . Tôi ước mong gì có thể giúc đỡ bạn ấy . Tôi chỉ muốn nói với bạn một câu " Hãy cố gắng lên nhé "
mk tự viết đó
10 tháng 8 2021
I have a big family which gives me everything that I need. My parents have two children, and we also live with our grandparents. Both of my parents have to work very hard to support this family, so they rarely have time to play with us. I am now a grown up boy, so I take the responsibility to take care of my little sister and grandparents when my parents are not home. My father is a manager of a Sell Apartment, and my mother works at the bank. They both have medium height and black hair, and they are very hard - working employees. They usually leave early in the morning without having breakfast at home, and my grandmother is the one who cooks for me and my sister. Both of them are just 75 and very healthy, they have grey hair and some wrinkles as well as freckles on their faces. They spend their free time to play with my sister whenever I go to school. I travel to school by bike, and I am a pretty good student. When I am home, I help doing the house chores, help my grandmother preparing the meals, and look after the baby. My hobbies are playing sports, but I only go out and play with my friends when both of my parents are at home at the weekends. My favorite time of the day is dinner time, because the whole family will all gather after a long day staying out. We spend that little time to talk about our days and share funny stories. Although my parents do not have much time for us, I still love and be thankful to have such a great family that.
KL
1
12 tháng 7 2016
Our environment now
This day, as society grows, the environmental issue has been becoming more and more important, it would affect life and human health. On the mass media every day, we can easily come across the images, information about the environment from pollution. Despite the call for environmental protection, pollution becomes increasingly severe. So, we have to fight and work together to protect our environment.
environment is essential for human life. Environment provides the conditions for people to live like breathing, eating, in ... ..Neu no such conditions that man can not live, survive and thrive. When live, do and learn in a good environment, cool atmosphere fresh ... we will feel comfortable and more excited, to help us understand and absorb the larger problem, at the same time (time) helps us to relax and feel more comfortable after hours of labor, learning so tired, tense and hard ... ..
But it can be said now people are gradually self-claimed his life. For economic development, to satisfy their greed, people cut down trees indiscriminately take away the fresh air and green environment of all of us, making the environment heavily contaminated and floods overflow; at the same time (time) they dig underground minerals; block water flow to hydro-power; emissions into the environment forming dust clouds filled the sky, and more of the waste that will puncture the ozone layer, cause acid rain kills trees, corrosion of buildings ... If you let air pollution continues, it will cause the greenhouse effect, making the climate warming, global climate change ... At the same time, industrial waste water, human activity, fertilizer, pesticides ... in the fields of river discharge polluting water sources and now people are drinking from that place, on the other hand also cause soil pollution makes increasingly arising illness more ...
What are we doing to our environment
It's all due to the serious lack of awareness of many people. Many people think that their stories do is too small, not enough to harm the environment. Some others said that to protect the environment is the responsibility of the state government that is not his. Others think about the environment has been polluted, it do not matter greatly, and that pollution will not affect her much ... Some other causes of pollution environment is the lack of corporate responsibility. Due to heavy set goals to maximize profit, not less business process violated craft operators, accumulated considerable part of environmental pollutants. Besides, the main thing is not close in environmental management and protection of the state has also provided incentives for environmentally destructive behavior continues; due to the speed of industrialization and urbanization rapidly .... And nhìu Another reason is none other but the man has been self-destructing his own habitat.
Seriously polluted sea
Environmental pollution is mainly caused by humans. Each person has accidentally or unintentionally make our living environment pollution days. To ensure sustainable development, human should have to live environmentally friendly, preserve, protect clean environment.
We all know that to protect the environment is not a task or a "work" that it is the sense of responsibility of each person, each individual on earth. Each of us must know themselves to preserve their own livelihoods. For this, we must be aware of the responsibility to protect the environment, is also protecting our lives.
These wastes must be carefully point, do not litter polluting the atmosphere and take the plastic paint. At the same time (hours), home centers, factories, industrial parks and industrial complexes ... to increase the exhaust gas treatment measures before putting them directly into the environment, thus minimizing new poison gas flow risk depriving health and human life. Then, each of us individually must consciously planted many trees, cumulative share makes fresh air and increase the aesthetic draw for the country. The authorities must strengthen propaganda and education, raise the sense of environmental protection of the people.
Let's join hands to make the world greener, cleaner, more beautiful
We should have to continue the work of protecting and cleaning up the environment with better measures, more practical. forms must be heavily sanctioned and strictly for individuals, organizations and agencies to conduct environmental damage, affecting the lives of people. Besides, we need to hold the meeting to discuss environmental issues at the ward level administrative units, communal ... Take a better article than the environment in the textbooks from grade elementary school, helping students with the attitude and the correct view of the environment and the consequences of doing environmental damage, thereby helping them to love and protect the environment we live in. Another way to help protect the environment is launched more often voluntary movements such as environmental protection residential areas, garbage in public areas, cleaning the beach ...
Not only that, every year on 05/06 days, all the people and governments around the world are organizing activities to improve the environment on this day, on "World Environment". Each year has its own theme, one that made the main focus for environmental activities in the year 2009 theme day "World Environment" is: "Your planet needs us! Link against climate change "and the next day 2010 theme" World Environment "is" Many Species - One Planet - One Future "and 2011 theme day" World Environment " the "Forest! value natural life", and this year 2012 theme day "world Environment" is "green Economy. Your role ". Not only on this day we act we must act together all the time everywhere. We must also restrict the use of plastic bags to bags, to food packaging; no hunting of wildlife, especially endangered species, owl species; Trash the prescribed places; should not abuse drugs of plant protection too much; Recycling waste into fertilizer; construction of parks and buildings nhìu real trees, planting trees along the roads, plant trees, aquarium trog home .... to our environment increasingly green, clean and beautiful. But the most important thing is still in the consciousness of each of us.
Environment is the common home of all humanity, environmental protection is not a word down that are demanding urgent and it must act now and protect the environment is to protect our river. Therefore, let us all join hands to protect the environment stronghold and prevent contamination. Because the future of a green earth, clean, beautiful, and because of our own life and that of future generations.
12 tháng 7 2016
Today, in the world, the environment is an issue of primary concern. In advanced countries, the issue of environmental hygiene should be emphasized is the littering and uncontrolled waste water almost gone. Educated people very carefully about environmental protection awareness of green living - clean - beautiful. Sadly, in our country, the phenomenon of throwing garbage on streets or public places, not hygiene very popular street. This practice has caused serious impacts on the environment that specifically here is polluting the environment. Given the current littering, then the consequences it entails nor small. First is affecting people's health. Indiscriminate garbage continuous discharge, more if not collected will stink, pollute the air environment. Water sources are polluted by inhabitants along the rivers for domestic waste discharged into the river, worse, they threw into the river H5N1 poultry. Unfortunately people use this water source to, or living near the landfills will be susceptible to intestinal diseases, skin diseases, trachoma ENH ... Especially in our country recently and more people die of consumption acute diarrhea caused by cholera from contaminated water. Littering behavior in public places is a matter of headaches authorities. Environmental protection is protected by the damage function for it to society, the life of the people, so each of us needs to be aware, to contribute jointly build a green-clean-beautiful .
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