\(\frac{a}{b}=\frac{c}{d}\)

=> \(\frac{a}{c}=\frac{b}{d}\)

=> \(\frac{a^2}{c^2}=\frac{b^2}{d^2}=\frac{3a^2}{3c^2}=\frac{ab}{cd}=\frac{5ab}{5cd}=\frac{a^2-b^2}{c^2-d^2}\)

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

\(\frac{3a^2}{3c^2}=\frac{5ab}{5cd}=\frac{a^2-b^2}{c^2-d^2}=\frac{3a^2+5ab}{3c^2+5cd}\)

=> \(\frac{a^2-b^2}{c^2-d^2}=\frac{3a^2+5ab}{3c^2+5cd}\)

=> \(\frac{3a^2+5ab}{a^2-b^2}=\frac{3c^2+5cd}{c^2-d^2}\)

=> Đpcm

Festival

There are many festival in the world but i like sakura festival best. thể are many reasons why i like it.This is a traditional Japanese festival called Hanami, which usually takes place in late March and early April.
Hanami is a word compounded by Hana meaning flower and mi means to look. Hanami means watching and admiring flowers. This festival is one of the oldest festivals in Japan for thousands of years and is an indispensable feature of Japanese culture.
Cherry blossom is the national flower of the sunrise. It symbolizes purity, fragility and purity.
The chore of cherry blossoms has been formed since the days of Nara, beginning with the arrival of several gods bearing the blossoming sprats of the emperor on the occasion of the beginning of spring. But it was not until the early 17th century that the Edo cherry blossoms were planted in the parks of Satora-Kura, a cherry blossom village, where cherry blossom festivals have taken place.
When spring comes, cherry blossoms blossom all over Japan and where flower festivals take place, especially in big cities like Tokyo, Osaka, Yokohama ... Only Tokyo has. 21 official spots were held in the cherry blossom festival on March 3 in major parks such as Ueno Park in Taito District, Shinjuku Goen Park in Shinjuku District, Yoyogi Koen Park in Harajuku District. ..
Cherry blossom is a flower blossoming quickly, from the time the flowers bloom until it lasts only about 10 days to 2 weeks. Depending on the climate of each region, cherry blossoms bloom at different times. In the south of Japan warmer flowers in January while the north may hatch in May. So flower lovers can travel from South to North to enjoy flowers as well as to mix into the air ceremony. Assembly all over the country.
In the warm spring, Japanese people often choose for themselves places to grow cherry flowers such as parks, along the river to organize picnic, flowers, chat, singing all day and night. They enjoy traditional food such as sushi, bento rice, sake or a drink often viewed as a flower called Hanamizake. At this moment, you can easily see sumo fighters or Japanese women in traditional kimono outfits.
Currently, cherry blossom festival is not only held in Japan but also in many places in the world such as Vietnam, America, Australia, etc. This is an opportunity for people to enjoy the look. Beautiful cherry blossoms as well as the opportunity for Japan to promote their cultural beauty.

I don't want much sugar in coffee .Just a little please

chờ mk xíu nhan

Football is such a popular game that it is played even in the most remote corner of my country. People walk long distances to watch a football match. Even old people enjoy watching this game.

To play this most interesting, I go to the field near my house where my friends wait for me every late afternoon. My friends also love this game very much. We play until dark.

But it is a very hard game. It requires a lot of strength to kick the ball. They must also be skillful in controlling the ball. All this makes the game a difficult game indeed. Playing football however help us healthy and active.

I shall always love this game.

If i am a president of 3rs club i will

First.Propagate people to protect the environment

Second. Call everyone should not litter indiscriminately but must collect aluminum cans, rubbish

Third, Propagate Strict performance on standard 3rs

Mk cũng mún giúp nhưng dài quá

1.Flying car

2.Solar energy

3.It looks like an eagle

3.Automatic technology

4.Over 1000 people

5.On air

There are many festival in the world but i like Sakura festival best.Thể are many reasons why i like it.This is a traditional Japanese festival called Hanami, which usually takes place in late March and early April.
Hanami is a word compounded by Hana meaning flower and mi means to look. Hanami means watching and admiring flowers. This festival is one of the oldest festivals in Japan for thousands of years and is an indispensable feature of Japanese culture.
Cherry blossom is the national flower of the sunrise. It symbolizes purity, fragility and purity.
The chore of cherry blossoms has been formed since the days of Nara, beginning with the arrival of several gods bearing the blossoming sprats of the emperor on the occasion of the beginning of spring. But it was not until the early 17th century that the Edo cherry blossoms were planted in the parks of Satora-Kura, a cherry blossom village, where cherry blossom festivals have taken place.
When spring comes, cherry blossoms blossom all over Japan and where flower festivals take place, especially in big cities like Tokyo, Osaka, Yokohama ... Only Tokyo has. 21 official spots were held in the cherry blossom festival on March 3 in major parks such as Ueno Park in Taito District, Shinjuku Goen Park in Shinjuku District, Yoyogi Koen Park in Harajuku District. ..
Cherry blossom is a flower blossoming quickly, from the time the flowers bloom until it lasts only about 10 days to 2 weeks. Depending on the climate of each region, cherry blossoms bloom at different times. In the south of Japan warmer flowers in January while the north may hatch in May. So flower lovers can travel from South to North to enjoy flowers as well as to mix into the air ceremony. Assembly all over the country.
In the warm spring, Japanese people often choose for themselves places to grow cherry flowers such as parks, along the river to organize picnic, flowers, chat, singing all day and night. They enjoy traditional food such as sushi, bento rice, sake or a drink often viewed as a flower called Hanamizake. At this moment, you can easily see sumo fighters or Japanese women in traditional kimono outfits.
Currently, cherry blossom festival is not only held in Japan but also in many places in the world such as Vietnam, America, Australia, etc. This is an opportunity for people to enjoy the look. Beautiful cherry blossoms as well as the opportunity for Japan to promote their cultural beauty.