My favorite sport is football. In America it is called Soccer . But I calling it Football. It has been my favorite sport for almost 3 years, when I was 8 years old, , even though praced it anymore, it is still the sport that I love most . Nowadays, most of people in the world football,so it is called the king of sports. Why do people it? I think the reason is that it is easy to play. You can play football every where with condition you have a ball with the right size. Not only men play football but also women can play. There is the World Champion for men players in one time after 4 years, and for Women as well. In addition, football have a big attraction. Every World cup is held, a large number of millions people it on TV and see it directly. Now there are many football club in each country, even district, school in the world. In the football today there are much more money involved, especially in sponsors. But players also cost a lot, There are many players such as C.Ronaldo, Beckham, Zidane who costs over 50 million euro, even over 100 million euro. Many big and famous club have large stadiums with alot of fan all over the world. They can get a great number of billion US dollar from broadcasting copywrite every year and a big avenue from sponsors and advertising. That proves the attration of football. To me, I football because it's a useful, healthful, collective but competitive sport. I overenthusias air on stadium on each match. Anyways football always is the most favorite sport of mine.

27x - 40 = 7x

<=> 27x - 7x = 40

<=> 20x = 40

<=> x = 2 

mơn nhaa :33

<3

a. Số học sinh khá của lớp 6A là:

\(40\times40\%=16\left(h/s\right)\)

Số học sinh trung bình của lớp 6A là:

\(16:\frac{8}{11}=22\left(h/s\right)\)

Số học sinh giỏi của lớp 6A là:

\(40-16-22=2\left(h/s\right)\)

b. Tỉ số phần trăm của học sinh giỏi so với học sinh cả lớp là:

\(2:40x100\%=0,05\%\)

Đáp số: ....

3/4-3/2+1/2:5/12-1/4

3/4-3/2+1/2.12/5-1/2

3/4-3/2+6/5-1/2

3/4-6/4+6/5-1/2

-3/4+6/5-1/2

-15/20+24/20-10/20

9/20-10/20

-1/20

2/3.x + 1/4 = 7/12

2/3.x           = 7/12 - 1/4

2/3.x           = 1/3

x                 = 1/3 : 2/3

x                 = 1/2

Bài làm

\(\frac{2}{3}x+\frac{1}{4}=\frac{7}{12}\)

\(\frac{2}{3}x=\frac{7}{12}-\frac{1}{4}\)

\(\frac{2}{3}x=\frac{7}{12}-\frac{3}{12}\)

\(\frac{2}{3}x=\frac{4}{12}\)

\(\frac{2}{3}x=\frac{1}{3}\)

\(x=\frac{1}{3}:\frac{2}{3}\)

\(x=\frac{1}{3}.\frac{3}{2}\)

\(x=\frac{1}{2}\)

Vậy \(x=\frac{1}{2}\)

Bài làm

17x - 28 = 12x - ( -42 )

=> 17x - 28 = 12x + 42

=> 17x - 12x = 42 + 28

=> 5x = 70

=> x = 14

Vậy x = 14 

\(17x-28=12x-\left(-42\right)\)

\(17x-28=12x+42\)

\(17x-12x=42+28\)

\(5x=70\)

\(x=14\)

Vậy \(x=14\)

tự kẻ hình nha

a) ta có xOy+yOz=xOz

=> yOz=120-50=70 độ

b) vì Ot là p/g của xOy=> xOt=tOy=xOy/2=50/2=25 độ

ta có tOz=tOy+yOz=25+70=95 độ

c) vì Om là tia đối của Ox=> mOz+xOz=180 độ=> mOz=180-120=60 độ

vì On là p/g của zOm=> mOn=nOz=zOm/2=60/2=30 độ

=> mOn/xOz=30/120=> mOn=1/4 xOz