ko nhắn linh tinh 

??? bn nhắn gì zậy

a) Ta có: \(\widehat{xOt}+\widehat{tOy}=90^0\)(hai góc phụ nhau)

\(\Leftrightarrow\widehat{tOy}=90^0-\widehat{xOt}=90^0-40^0\)

hay \(\widehat{tOy}=50^0\)

Vậy: \(\widehat{tOy}=50^0\)

Nowadays,many people spent much time watching television.It can't be denied that since television was invented,it has changed our life in many ways ,and brought us many advantages as well as disadvantages.

Television plays an important role in our daily life.It's very informative.Through television,we can get the latest information easily and rapidly without leaving home.We can learn more and more about the world we live and see many interesting things.Our knowledge is broadened in many ways.

Secondly,televiosin helps us to enrich our spiritual lives.In parular,we can learn the language we such as English,Chinese,France,Spanish,Japanese.....through language programs.We can be good and clever at doing jobs,making cake,cooking,arranging flowers through pracal course which is taught on television.

And watching is an enjoyable way to relax.After a hard-working day,it's so comfortable and fun to sit at the armchair and see a movie or watch a comedy program.There are also educational programs on television,so children can learn a lot from these programs.

On the other hand,televiosion has some disadvantages.It has negative effects,especially for children.Some movies contain violence or crime.Therfore,the evil influence of televison on the young generation is inevitable.It encourages them to commit crime,or make children grow up to be violent adults.

What's more,watching television too much makes us passive.When watching TV,our brains don't need to work.Therefore,our brains become lazier.Watching TV too much is also bad for our eyes.This is the main cause that leads to short-sightened.

All things considered,everything has two sides,advantages and disadvantages.Television will be useful to us of only we know how to use it correctly.

What would you do after a hard day at school and you want to entertaining. It simple, just turn on your TV. Music channel, comedy channel or cartoon channel... is your choice, just pick a channel. And not only entertaining, TV can also help you update the news from all over the world in the end of the day. When you bore you can go anywhere you : Paris, New York, London just pick travel channel. As you can see TV have many advantages but you still can deny it have a disadvantage. Now you have about 30 channel with you favorite program and you don't want to miss. And you end up spend all day long to watch TV, and you forget to do other thing. hang out with your friend, sea everything with your own eye, or just forget to focus study for the exam. You can control your life, you are the boss, so you should find the best way to rise your TV, so it only have advantages.

6C                           12D                      7C                           13C                     8D                           14B                  9B                           15B                    10D                         16C                       11A

6A

7C

8D

9A

10D

11B

12A 

13C

14D

15

16c

 1530   15

   030   102       học tốt

       0

101 nha bạn

Bài 3 : 

\(\Delta'=\left(m-1\right)^2-\left(m-2\right)\left(m+1\right)=m^2-2m+1-m^2+m+2=-m+3\)

Để pt có 2 nghiệm 

\(\Delta'=3-m\ge0\Leftrightarrow m\le3\)

Theo Vi et : \(\left\{{}\begin{matrix}x_1+x_2=\dfrac{2\left(m-1\right)}{m+1}\\x_1x_2=\dfrac{m-2}{m+1}\end{matrix}\right.\)

Thay vào ta được : 

\(\dfrac{6\left(m-1\right)}{m+1}=\dfrac{5\left(m-2\right)}{m+1}\Leftrightarrow\dfrac{6m-6-5m+10}{m+1}=0\)

\(\Leftrightarrow\dfrac{m+4}{m+1}=0\Leftrightarrow m+4=0\Leftrightarrow m=-4\)(tmđk) 

bạn đăng tách câu hỏi ra nhé 

1.chọn a hoặc an

an insect

an orange 

a basketball

an elephant

a toy

an apple

a shirt

Những từ có các nguyên âm i,o,a,e,u thì chọn an

Còn lại thì chọn a

an insect

an orange

a basketball

an elephant

a toy

an apple

a shirt

Đáp án C

câu c

MÌNH CÓ MỘT ĐỒ CHƠI BUNNY, SHE TÊN MIN, RẤT THÚ VỊ VÀ DỄ THƯƠNG

TÔI YÊU ĐỒ CHƠI BUNNY

MÌNH CÓ MỘT ĐỒ CHƠI BUNNY, SHE TÊN MIN, RẤT THÚ VỊ VÀ DỄ THƯƠNG TÔI YÊU ĐỒ CHƠI BUNNY