\(\frac{2^2}{2.4}+\frac{2^2}{4.6}+...+\frac{2^2}{26.28}\)

= \(2.\left(\frac{2}{2.4}+\frac{2}{4.6}+...+\frac{2}{26.28}\right)\)

= \(2.\left(\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{6}+...+\frac{1}{26}-\frac{1}{28}\right)\)

= \(2.\left(\frac{1}{2}-\frac{1}{28}\right)\)

= \(2.\frac{13}{28}\)

= \(\frac{13}{14}\)

what???

Give the correct form of the capital words.

1. The Red river is 1.200 kilometers long

2. Ba is the tallest student in the class.

3. The building is 500 years old

Đặt câu hỏi cho phần in đậm.

1.Lan wants to go fishing

=> What does Lan want?

2.My father never goes fishing because he doesn't like it

=> Why does your father never go fishing?

Here is a ___ture of my country?

=> Here is a picture of my country?

Do you know how much a banana ____? - About 2.000 dong

=> Do you know how much a banan cost? - About 2.000 dong

___h classes do you have on Friday?- We have Music and Arts

=> How classes do you have on Friday?- We have Music and Arts

As a se____man, Herry alway look calm and make a wise decision

=> As a sensible man, Herry alway look calm and make a wise decision.