Trình bày khái quát kinh tế của các quốc gia: Nhật Bản, Trung Quốc, Ấn Độ

Xong chưa bác!

d,Từ câu c, ta có:

\(\text{DI=CI}\Rightarrow\Delta DIC\) cân tại I \(\Rightarrow\widehat{IDC}=\widehat{ICD}\)

\(\widehat{DIC}=180-\widehat{IDC}-\widehat{ICD}\)

\(\text{Ta có: }\widehat{CHI}+\widehat{HIC}+\widehat{HCI}=180\) \(\Rightarrow\widehat{HIC}=180-\widehat{CHI}-\widehat{HCI}\)

\(\Rightarrow\widehat{DIC}+\widehat{HIC}=360-\left(\widehat{CHI}+\widehat{HCI}+\widehat{IDC}+\widehat{ICD}\right)\)

\(=360-180=180\)

\(\Rightarrow\text{Ba điểm D;I;H thẳng hàng }\)

nửa chi vi : 480 : 2 = 240 ( m )

chiều dài : 240 : ( 1 + 3 ) x 3 = 180 ( m )

chiều rộng : 240 - 180 = 60 ( m )

diện tích : 180 x 60 = 10800 ( m2 )

trên thửa rộng đó thu được số tấn thóc là :

10800 : 0,5 = 21600 ( kg )

đổi : 21600 kg = 21,6 tấn 

đáp số : 21,6 tấn

b,Từ câu a, ta có:

\(\Delta ACD\) cân tại A

Mà AE là đường trung tuyến ứng với cạnh đáy CD

\(\Rightarrow\) AE là tia phân giác của \(\widehat{CAD}\) \(\Rightarrow\widehat{CAI}=\widehat{DAI}\) \(\left(1\right)\)

Xét \(\Delta ACI\) và \(\Delta ADI\) có:

AC=AD

\(\widehat{CAI}=\widehat{DAI}\) \(\text{ theo }\left(1\right)\)

\(AE\) chung

\(\Rightarrow\Delta ACI=\Delta ADI\) \(\left(c-g-c\right)\)

\(\Rightarrow DI=CI\)

An:12km/giờ

Bình : 6km/giờ

Read the following passage and choose the best answer for each blank.

“Water polo is a new sport at our school, but we have a good team now. We practise after school on Thursday at the Northside Pool and we're doing well in the National Schools Competition.

There are seven players in a water polo team. The game is a bit like football because each team tries to score a goal with a ball. But in water polo you don’t use your feet - you catch and throw the ball with one hand. And you never stop swimming. A game lasts 32 minutes, and in that time you swim up and down a 30-metre pool lots of times. If you aren't fit, water polo isn’t the sport for you!

For me. it’s great. because | love being in the water and | can swim fast. I also enjoy being part of a team. We have some excellent players and we're all good friends. So it's fun, and it's also a fantastic way to get fit.”

Leo Johnson

 People play water polo ________.

A. in a stadium 

B. in a swimming pool 

C. at the beach 

D. x