có vì áp dụng bđt svacxơ: \(\frac{1}{a}+\frac{1}{b}>=\frac{\left(1+1\right)^2}{a+b}=\frac{4}{a+b}\)

với a,b>0

\(\Leftrightarrow\frac{2x}{x-1}+\frac{1}{x-1}=\frac{5x}{x+1}-\frac{5}{x+1}\)

\(\Rightarrow-\frac{5x}{x+1}+\frac{5}{x+1}+\frac{2x}{x-1}+\frac{1}{x-1}=0\)

\(\Rightarrow-\frac{3x^2-13x+4}{\left(x-1\right)\left(x+1\right)}=0\)

=>3x²-13x+4=0

=>(x-4)(3x-1)=0

=>x-4=0 hoặc 3x-1=0

=>x=4 hoặc 1/3

1-1=0

đáp số:0

mik mmới học mong chỉ dạy nhiều hơn

xin cảm ơn

3103 ban nha

linh có số kẹo là:

3*2=6(cái kẹo)

2 bạn có số kẹo là:

6+3=9(cái kẹo)

đáp số: 9 cái kẹo

Choose the best option to comeplete each of the the following sentences

20. Lien looks worried becaue she often ______ to brush her teeth

A. forget

B. forgets

C. to forget

D. forgetting

40. Solar energy______ by many countries in the world in the future

A. use

B. will use

C. will be using

D. will be used

Tổng độ dài đáy là:

60 x 2 : 5 = 24 ( m )

Đáy lớn là:

( 24 + 4 ) : 2 = 14 ( m )

Đáy bé là:

24 - 14 = 10 ( m )

Đáp số: Đáy lớn: 14 m.

            Đáy bé : 10 m.

III. Find and correct mistakes in the following sentences:

1. I am liking history because it's an interesting subject =>......................

2. One of the world's largest libraries are the United States'sLibrary of Congress =>.................

3. Xuan Dieu's Book of Poems are in the Vietnamese literature section of the library =>......................

4. The scholl cafeteria only opens at lunchtimes =>................

5. You can find different dictionaries on the shelfs for reference books =>.........................

6. My usual seat is in the back of the classroom => .....................

7. With these two sets of cards you can easily find a book with either the author and the title =>...................

8. The magazines on this rack is in English =>..............

9. After the first three lessons, we have a twenty-minutes break =>.......................

10. Tim is at the same age as Hoa =>.............

11. At recess, the students practice to play basketball =>.............

12. Do you know how much a banana cost ? =>....................

13. Almost people were shock by the way the film star behaved =>............

Giúp mk vs