3 + 4 = 7 là đúng nhé

đúng nha

4/7= 4x2/7x2= 8/14

3/2= 3x7/2x7=21/14

5/4=5x3.5/4x3.5= 17.5/14

Mẫu số chung là : 28

\(\frac{4}{7}\)= \(\frac{4x4}{7x4}\)= \(\frac{16}{28}\)

\(\frac{3}{2}\)= \(\frac{3x14}{2x14}\)= \(\frac{42}{28}\)

\(\frac{5}{4}\)= \(\frac{5x7}{4x7}\)= \(\frac{35}{28}\)

#HT~

Có tất cả bao nhiêu số tự nhiên có 4 chữ số khác nhau?

Có 9 cách chọn chữ số hàng nghìn(vì chữ số 0 không thểđứngđầu)

Có 9 cách chọn chữ số hàng trăm(vì khác chữ số hàng nghìn)

Có 8 cách chọn chữ số hàng chục(vì khác chữ số hàng nghìn , trăm)

Có 7 cách chọn chữ số hàngđơn vị(vì khác các chữ số hàng trăm chục nghìn)

Có số số có 4 chữ số khác nhau là: \(9\times9\times8\times7=4536\left(\text{số}\right)\)

có 4536 số

HT

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\(\text{Đề bài}:\frac{5}{2}dm^2=?cm^2\)

\(\text{Trả lời}\)

\(\frac{5}{2}dm^2=250cm^2\)

5/2 dm2=250 cm2 nha

HT

k cho mình nha

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no no no

ko lằm thì đừng nhắn

x-53=456

     x=456 +53

     x=509 

mong bạn k

x=509 nha

HT

k cho mình nha

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My name is Long and I’m a Vietnamese. I am twenty-four years old. I live in Ho Chi Minh city in the south of Vietnam.

I have a big family with six people. I have two sisters and a brother. My sisters are older and my brother is younger than me. My father is a teacher at a secondary school. He has worked for 35 years in the field and he is my biggest role model in life. My mother is a housewife. She is nice and she is really good at cooking. I love my family so much.
I’m a generous and easy-going person but when it comes to work I’m a competitive perfectionist. I’m also an optimis and outgoing person so I have many friends and other social relationships. I enjoy reading, writing and doing math. I decided to become a Civil Engineer because I have always been fascinated by bridges, buildings, and skyscrapers. A degree in Civil Engineering enables me to achieve my goals and also gives me an opportunity to make a difference in the community.

Five years from now, I want to become a project manager of a construction project. As a project manager, my primary goals are managing people, set budgets, and making decisions of all kinds. I also want to speak English fluently so I can work with people from different countries.

1/5 số gạo tẻ đã bán là:

158 + 38 = 196 (kg)

Số gạo tẻ đã bán là:

196 : 1/5 = 980 (kg)

980 kg nha

HT

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