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7 tháng 5 2019
D A B C E F
a)Xét \(\Delta\)ABD và \(\Delta\)AED:
AB=AE
BAD=EAD
AD chung
=>\(\Delta\)ABD=\(\Delta\)AED(c-g-c)=>BD=ED
AB=AE=>A nằm trên đường trung trực của BE
BD=ED=>D nằm trên đường trung trực của BE
Suy ra AD là đường trung trực của BE
b)FBD+ABD=180
DEC+AED=180
Mà ABD=AED
Suy ra: FBD=DEC
c)Xét \(\Delta\)BFD và \(\Delta\)EDC
BDF=CDE(đối đỉnh)
BD=ED
FBD=DEC
=>\(\Delta\)BFD=\(\Delta\)EDC(g-c-g)
LA
7 tháng 5 2019
a) ta có: tam giác ABE cân tại A ( AB = AE)
mà AD là phân giác góc BAE
=> AD vừa là phân giác, vừa là đường trung trực
=> AD là trung trực của BE
b) Gọi giao điểm của BE và AD là I
xét tam giác BDI và EDI
BD = DE ( DA là đường Trung trực của BE)
DI cạnh chung
BI = IE ( AD là trung trực của BE)
=> tam giác BDI = tam giác EDI ( C-c-c)
=> BDI = IDE
ta có FBD = BDA + BAD ( góc ngoài tam giác BAD)
DEC = ADE + DAE ( góc ngoài tam giác EAD)
mà BDA = EDA
BAD = EAD
=> FBD = DEC (đpcm)
chúc bạn thi tốt
PP
0
NN
1
23 tháng 12 2016
Hobby
My hobby I like most is listening to music. I started listening many kind of music when I was a little girl.
I like many kind of music, especially I am interested in the US - UK songs. I studied English to understand the meaning of the songs I have heard. At first, I listened country music. They were quite slowly and it was quite easy to hear and understand them. Now, I can understand most of all the US - UK songs I have heard. That's so great!
I have usually spent my free time to listen the best songs. I like listening to music because my soul is relaxed when I listen.
Music would be my lifelong friend. I would never stop listening to music.
KY
1
KT
22 tháng 10 2018
I want to provide evening classes for poor children. I want to do it because we will help poor children study better. They will fell happy and excited. I will ask voluteers to help me. We will donate old books for them
5 tháng 1 2017
It is English subject that I like best in school. I like English because it helps me open the big world. First of all, I can talk with people who are in the English-speaking world. Secondly, I can find many documents written by English for studuing. Thirdly, I can watch movie and news without subtitle. Last but not least, it makes me interesting when studying. To study it well, I sometimes take a note and past it in somewhere in my room. I always do all exercises before going to school. And I am very enthusiastic in the class. English is known to be very dificult and many students hate studying it. It my feeling that the problem is the methods teaching of Vietnam is not suitable. Student must study grammar hardly. I hope it will change in the future. In short, English is very necessary for modern life, I hope all students find in interesting.
19 tháng 4 2018
well, I am a very foody person and there are a lot of food I . It is quite difficult to think of one. I would to talk about a popular menu in my country which is one of my favourite food also. It is steamed/plain rice and shahi paneer. I belong to Punjabi family so that I love spicy and shahi foods.
I will talk about how I cook my shahi paneer at home. A small amount of oil is placed in a heated pan. Then, I put some finely chopped garlic until it turns golden brown. Add onions.when it turns golden brown then I blend it with help of a blender. a mixture of this I put some chopped tomatoes and heat it again.after that I add some cashews and fresh cream which provide creamy and rich gravy of our shahi paneer.apart from that then add paneer cubes, all spices and cook it till 20 minutes. Then it is done and ready to be served. You may also add some curd in place of fresh cream.
I it because it is easy to prepare and it is very delicious. gravy of this also feel me rich and when I taste it just melted our mouth.
This recipe is common in my country and I eat it about a twice week. I it because it does not require much effort to prepare and it is also not expensive.
Do you feel okay? Good luck to you.
Hope you get good grades.
19 tháng 4 2018
Cause:
The Viruses:
One reason why there is no cure for the common cold is that more than 200 different viruses can cause cold symptoms.
Some, such as rhinoviruses, seldom produce serious illnesses.
Others, such as respiratory syncytial virus (RSV), produce mild infections in adults but can lead to severe lower respiratory tract infections in young children.
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Rhinoviruses (from the Greek rhin, meaning “nose”) cause an estimated 30 to 50 percent of all colds. Scientists have identified more than 100 distinct rhinovirus types. Rhinoviruses grow best at temperatures of about 9IT, (the temperature inside the human nose). Scientists think coronaviruses cause about 10 to 15 percent of all adult colds. They bring on colds primarily in the winter and early spring. Although many coronaviruses infect animals, only five infect humans, causing respiratory tract illness.
Adult cold symptoms also are caused by viruses that are responsible for other, more severe illnesses. These viruses are: adenoviruses, coxsackieviruses, echoviruses. orthomyxoviruses (including influenza A and B viruses, which cause flu), paramyxoviruses (including several parainfluenza viruses), RSV, and enteroviruses. Researchers still haven’t identified the causes of 20 to 30 percent of adult colds, presumed to be viral.
The cold season:
Seasonal changes in relative humidity also may affect the occurrence of colds. The most common cold-causing viruses survive better when humidity is low Cold weather also may make the inside lining of your nose drier and more vulnerable to viral infection.
Other factors:
Although a connection exists between the number of cases of the common cold and the fall and winter seasons, there is no experimental evidence that exposure to cold temperatures increases the chances of getting a cold. On the other hand, several research studies show that people who exercise regularly have a significantly reduced number of respiratory tract infections, such as the common cold, compared with those who don’t exercise. Research also suggests that allergic diseases that affect the nose or throat and psychological stress may increase your chances of getting infected by cold viruses.
Common Cold:
Symptoms:
Symptoms of the common cold usually begin 2 to 3 days after infection and often include:
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1. Sore throat
2. Mucus buildup in the nose
3. Difficulty breathing through nose
4. Swelling of sinuses
5. Sneezing
6. Cough
7. Headache
8. Tiredness
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Although fever is uncommon in adults, it is often found in children with colds and can climb to 102°F in infants and young children. Cold symptoms can last front 2 to 14 days. High fever, significantly swollen glands, severe sinus pain, and a cough that produces mucus may be signs of complication or more serious illness.
Treatment:
There is no cure for the common cold, but you can get relief from your cold symptoms by
1. Resting in bed
2. Drinking plenty of fluids
3. Gargling with warm salt water or using throat sprays, or lozenges for a scratchy or sort’ throat
4. Using a decongestant or saline nasal spray to help relieve nasal symptoms
5. Using petroleum jelly to soothe a raw nose
6. Taking aspirin or acetaminophen—Tylenol, for example—for headache or fever Colds occasionally can lead to bacterial infections of your middle ear or sinuses, requiring treatment with antibios. However, antibios should not be used to treat a cold.
Prevention:
There are several ways you can keep yourself away from getting a cold of infecting others:
1. Because cold viruses can easily enter into your eyes and nose through hands, wash hands often and keep the hands away from those areas of your body.
2. 11 possible, avoid being close to people who have colds or If you have a cold, avoid being close to people.
3. When you sneeze or cough, cover your nose of mouth arid sneeze or cough into your elbow rather than your hand.
Hand washing:
Hand washing with soap and water is the simplest and one of the most effective ways to keep from getting colds or giving them to others.
Disinfecting:
Rhinoviruses can live up to 3 hours on your skin or on objects. Cleaning these environmental surfaces in your home or place of work with a virus-killing disinfectant might help prevent the spread of infection.
Vaccine:
Because so many different viruses can cause the common cold, the outlook for developing a vaccine that will prevent spreading of all of them is quite a challenge.
Alternative Medicines:
Echinacea:
Echinacea is a dietary herbal supplement that some people use to treat their colds.
Vitamin C:
Many people are convinced that taking large quantities of vitamin C will prevent colds or relieve symptoms.
Honey:
Some people use honey to treat coughs and to soothe a sore throat.
Zinc:
Zinc lozenges and lollipops are available over the counter as a remedy for the common cold. In 2009, the Food and Drug Administration warned consumers to stop using intranasal (in the nose) zinc products because some people reported a loss of smell after using these products.
1, Nick's hobby is collecting stamps . He is a stamp collector .
2, Hoa is very creative and she paints very well .
3, My uncle usually takes a lot of beautiful photos .
4. I think collecting old bowls is a very boring hobby. (BORE)
5. You can use carved eggsshells as decoration in your house. (DECORATE)
6. I reading books because it .....widen...... my knowledge. ( WIDE )
7. Model making is a .....wonderful....... ways of spending time. ( WONDER )
8. Reading books can also develop our ...imagination...... ( IMAGINE )
9. That girl can use leaves to make ....musical........... sounds. ( MUSIC )
10 You should choose a hobby because it will give you ......pleasure............. and help you relax. ( PLEASE )