\(\dfrac{\text{11× -12 + 11 × -5 }}{\text{19× 17+ 19× 17}}\)\(+ 2\)

Tính giúp em với ak 

Ai làm nhanh nhất sẽ tick người đó nhé

Đáp án + Giải thích các bước giải :

`2x`.`2012/18=184`

`→2x=184:2012/18`

`→2x=828/503`

`→x=828/503:2`

`→x=414/503`

Vậy `x=414/503`

`@Cam`

\(\color{red}{\text{Trả lời :}}\)

- Hình 36.2B:

+ Cây rong đuôi chó chìm trong nước: phiến lá nhỏ, dài và mảnh giúp tránh được những tác động của sóng nước.

- Cây bèo tây khi sống ở trên mặt nước và trên cạn có các đặc điểm khác nhau:

+ Hình 36.3A: Trên mặt nước: cuống lá phình to, bóp nhẹ thấy mềm và xốp giúp cây dễ nổi trên mặt nước, thân xốp bên trong chứ nhiều O giúp cây hô hấp.

+ Hình 36.3B: Cây sống trên cạn: cuống lá thon dài, cứng giúp phiến là vươn cao nhận được nhiều ánh sáng.

\(\color{red}{\text{Tick cho mik nha}}\)

\(\color{red}{\text{Tìm X }}\):

\(a) |x|=\)\(\dfrac{1}{5}\)\(+\)\(\dfrac{3}{4}\)

\(b)|x-5|=-\)\(\dfrac{5}{3}+\dfrac{1}{4}\)

\(\color{red}{\text{Giúp em với ak}}\)

Many people worked to create television. In 1862, Abbe Giovanna Caselli invented a machine called the Pantelograph. Caselli was the first person to send a picture over wires. By the 1880s, Alexander Graham Bell invented a machine that transmitted pictures and sound over wires. His machine was called the Photophone. The World’s Fair was held in Paris, France, in the year 1900. The first International Congress of Electricity was held at the World’s Fair. That was when the word television was first used - by a Russian named Constantin Perskyi. That name stuck, and is now shortened to "TV." At the beginning of TV history, there were several types of TV technology. One system was a mechanical model based on a rotating disc. (Rotating discs are discs that spin like CDs.) The other system was an electronic model. In 1906, Boris Rosing built the first working mechanical TV in Russia. In the 1920s, John Logie Baird in England and Charles Francis Jenkins in the United States demonstrated improved mechanical systems. Philo Taylor Farnsworth also showed an electronic system in San Francisco in 1927. His TV was the forerunner of today’s TV, which is an electronic system based on his ideas. Now TV is everywhere. Before 1947, there were only a few thousand televisions in the U.S. By the 1990s, there were televisions in 98% of American homes.

1.A system is a combination of...

2.The word television was first used in...

3.Who first sent a picture over wires?

4.Who invented the Photophone?

5.The best synonym for demonstrated is...

Giúp em với ak

Cô ơi , giúp em bài này đc ko cô

https://hoc24.vn/cau-hoi/l-x-1-l-l-y-2-l-2lam-giup-em-akco-huong-dan-giai-nua-ak.333821796387

l x-1 l + l y-2 l ≤ 2

Làm giúp em ak

Có Hướng dẫn giải nữa ak

He passed the exam although he didn't study much.

1.c

2.a

3.a

4.b

5.b

6.c

7.b

8.b

9.a

10.b

Bn giúp mik câu dưới đc ko