Cho ad = bc và a, b, c, d khác 0. Chứng tỏ rằng:
a) \(\dfrac{a}{b}\) = \(\dfrac{c}{d}\) b) \(\dfrac{a+c}{b+d}\) = \(\dfrac{a}{b}\) c) \(\dfrac{a}{c}\) = \(\dfrac{b}{d}\) d) \(\dfrac{a+b}{b}\) = \(\dfrac{c+d}{d}\) e) \(\dfrac{2a+b}{2c+d}\) = \(\dfrac{a}{c}\)
Xác định phương thức biểu đạt, nội dung chính, ý nghĩa và bài học rút ra từ đoạn trích sau:
Không hiểu bằng cách nào, một hạt cát lọt được vào bên trong cơ thể một con trai. Vị khách không mời mà đến đó tuy rất nhỏ, nhưng gây rất nhiều khó chịu và đau đớn cho cơ thể mềm mại của con trai. Không thể tống hạt cát ra ngoài, cuối cùng con trai quyết định đối phó bằng cách tiết ra một chất dẻo bọc quanh hạt cát.
Ngày qua ngày, con trai đã biến hạt cát gây ra những nỗi đau cho mình thành một viên ngọc trai lấp lánh tuyệt đẹp...
Ex2: Complete the sentences, use given words
1. The Yao people/have/population/about/751,067/people/living/provinces/northwest mountainous regions,/Lao Cai, Dien Bien, Lai Chau,..
2. The Yao language/belong/ideograms/Chinese origin.
3. They/grow/rice/corn/vegetables/raise/cattles and poultry/their own use.
4. They/also/work/offices/factories/earn/their/living.
Ex1: Choose the best answer
8. Many ethnic people still live in (earth/ earthen/ earthing) houses or in (stilt/ stilting/ stilted) houses. Their living condition is still in difficulty.
9. Most students in (board/ boarding/ boarded) school are ethnic people.
10. (Nomadic/ Nomadise/ Nomadism) was a traditional way of living of the ethnic people, but now it doesn't exist.
11. Viet Nam is a (multicuture/ multiculturally/ multicultural) country with 54 ethnic groups.
12. Ethnic people raise cattle and poultry to use for (their/ them/ their own).
Giúp mình với
Ex1: Choose the best answer.
1. Many people from urban areas likes to go to (open-air market/ market air-open/ market open-air).
2. Many people go to the local markets to buy good local products because thay think that they are (fresh/ rotting/ cheap).
3. Ethnic peoples in Northwest have a rich culture of (traditional/ modern/ folk) literature and art, with tales, songs, and poems.
4. Food of different people's has it own (smell/ speciality/ taste).
5. Traveling to the Northwest, yiu can enjoy some (food/ good/ specialities) of local people.
6. We can find (terraced/ terracing/ terrace) fields in the northern moutainous regions.
7. (Hunt/ Hunting/ Hunted) and cutting woods in the forests are still typical activities of ethnic peoples.