Đặt \(\int f\left(x\right)dx=F\left(x\right)\Rightarrow\int\limits^{17}_1f\left(x\right)dx=F\left(17\right)-F\left(1\right)\)

Từ giả thiết:

\(2x.f\left(x^2+1\right)+\dfrac{f\left(\sqrt{x}\right)}{2\sqrt{x}}=2lnx\)

Lấy nguyên hàm 2 vế:

\(F\left(x^2+1\right)+F\left(\sqrt{x}\right)=2xlnx-2x+C\)

Thay \(x=4\):

\(F\left(17\right)+F\left(2\right)=16ln2-8+C\) (1)

Thay \(x=1\):

\(F\left(2\right)+F\left(1\right)=-2+C\) (2)

Trừ vế cho vế (1) cho (2):

\(F\left(17\right)-F\left(1\right)=16ln2-6\)

Vậy \(\int\limits^{17}_1f\left(x\right)dx=16ln2-6\)

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

thường lúc chỉ thi thì thì dạng toán cần phải học là :

tính toán phân số , số thập phân

mấy bài toán đố về hình học 

cuối cùng là tìm x

bạn phải học toán về hình hoc , tìm x , tỉ số phần trăm  , phân só ,số thập phân và hỗn số ( cả toán đố của các dạng bài trên nữa)

chi cho minh nua

Câu 4: 

1) Ta có: \(A=99\cdot101\)

\(\Leftrightarrow A=\left(100-1\right)\left(100+1\right)\)

\(\Leftrightarrow A=100^2-1\)

mà \(B=100^2\)

nên A<B

My house is located in a small quiet alley. That’s a pretty pink house which consists of 6 rooms in totally: a living room, a kitchen, a toilet, a bathroom and two bedrooms. There are a white leather sofa, a television and a sideboard in the living room. After dinner, my father will turn on the television, choose a great movie and we watch it happily. Next to the living room is the kitchen where is used for cooking and enjoying the meals. In the middle of the room is a dinner table which is made from wood. Three cookers, a refrigerator and all the neccesary stuff for cooking is arranged carefully in the right corner of the room. In the left of the kitchen is a clean toilet. Beside the toilet is the bathroom which is equipped a shower and a bathtub. There are only two rooms upstairs that is my parents’ room and my private room. I’ve decorated my bedroom with adorable wallpaper and many lovely stuffed animals. A single bed is placed next to the window so that I can stargaze before falling asleep. In the opposite of the bed are my desk and my bookshelf that contain many kinds of book. There are also an old television and a piano in my bedroom. I especially love the piano because that was the gift from dad in my birthday. In every Christmas or Tet holiday, all member of my family ornament the house together and then gather in the kitchen to cooking. Although my house is not too big but to me that is the most beautiful house in the world.

Nếu đúng thì k cho mình nha bn

 

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:

Sort your rubbish. Organic items like potato peeling, leftover food, and tea leaves can be transferred into a compost heap in the garden and used as a natural fertilizer for plants. Plastic bottles, juice cartons, and cardboard can be taken to a recycling bank.Use recycled papers to help save trees. It has been estimated, that each person uses about 6 trees worth of paper yearly.Avoid buying plastic since is difficult to recycle. Refuse to use plastic bags offered by supermarkets; instead, use long-lasting shopping bags or re-use the same plastic bags until they are worn out and then can be recycled.Do not buy over-packaged goods – many items we purchase are enclosed in unnecessary bits of plastic and paper.

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.

Here is an example of an essay for sale at our site. Our company offers professional writing services for a cost. If you think that you lack proficient writing skills or you feel at a loss in writing an essay, report, research paper or some other kind of writing, or need someone to do your homework, simply use our custom course work writing service to get the desired help.

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120 từ thôi bạn ơi. mình dở tiếng anh. giúp mình với

Keep trees: Trees absorb carbon dioxide, prevent soil erosion and provide habitat for all living things. Keep trees by selecting interior decorations from materials such as eco-friendly bamboo, for example. Do not be too trendy, look for these types of tables and chairs, wardrobe and so durable medium saving money does not contribute to increasing the amount of waste on the environment.

Using natural materials: Did you know that plant protection drugs and chemicals used in daily hygiene are dying as we are one of the causes of diseases such as Parkinson's , cancer and diseases related to the brain. So why not use chemicals derived from natural and efficient utilization of the relationship between the struggle for survival in the wild species to control the pest.

Withdraw the plug from the socket: Maybe you do not know that the order for household electrical appliances in "standby" for a long time did spend a large amount of electricity, so unplug the plug from the shank drive or power off all devices such as hair dryers, computers, televisions, mobile phone charger ... when not in use.

Using clean energy: Use of energy sources renewable whenever possible, such as energy from wind, sun ... This is the kind of clean energy for the production and consumption they do not give rise to emissions causing the greenhouse effect as using fossil fuels.

3R principles (Reduce, reuse, recycle and): Reduced use - reuse - recycle used products, let's face the fact that we consume more than what nature can give us and things are drying up, including water! Therefore, first reduce consumer demand of ourselves than to re-use and re-use will also more environmentally friendly to recycle the discarded product!

(Artwork: Environment-prize.com) I bath in our pond! Priority use of the produce is from local producers, so will reduce the shipping is one of the causes of increased energy consumption and emissions of toxic gases. Think about it, and not just to use frozen fruits from thousands of kilometers away from the bearing until around us full of tropical fruits delicious and nutritious.

Save paper: Take advantage of surfing the web to search for information, instead of focusing on reading the newspaper, send email and files instead of writing a letter, it is that you have contributed to the protection of trees - is the main raw material production paper.

Reduce the use of plastic bags: Do you believe that the plastic bag can not be biodegradable, so they can survive in the environment for hundreds of years and to produce 100 million plastic bags consume 12 million barrels of oil , so please use paper, leaves ... to package rather than using bags.

Leveraging sunlight: Why do not you open your house window launched whenever possible to catch the sunlight instead of using all kinds of lights, so you will reduce the amount of power consumption receptor, and save your money.

Use of scientific progress: Use fluorescent lamps although a little more expensive, but they last longer and save up to 75% energy compared to normal light bulbs. But it also noted that they contain small amounts of mercury, but not enough to harm you but will accumulate in the environment if not collected and handled well.