Gọi a là số sách
Theo đề a:10,a:12,a:15
=>a e BC(10,12,15)
BCNN(10,12,15)=60
BC(10,12,15)=B(60)e {0,60,120,180,..}
Mà 100<a<150
Nên a =120

đây là Oline Math chứ đâu phải Oline Birthday 

"You should spend a little time time your mom" He said to his sister.

=> He said his sister that she should spend a little time for her mom.

I) Use the give words to make a meaningful sentence:

1, mai/be/intelligent/pupil.

=> Mai is an intelligent pupil.

2, there/be/unique/picture/living room.

=> There is an unique picture in the living room.

3,there/be/attractive/present/for/winner.

=> There is an attractive present for the winner.

You wil get me that ink-pot from the table please.

1, Harry takes sugar in tea, doesn't he?

Chuyển sang câu bị động:
1. She often takes her dog for a walk.

=> Her dog is often taken for a walk.
2. Farmer usually milk cows twice a day.

=>(Ko có động từ =.=")

3. People know that Japan produces a wide range of cars.

=> Japan is known to produce a wide range of cars.
4. What language do people speak in this country?

=> What language is spoken in this country?

Chuyển sang câu bị động:

1) They didn't allow Tom to take books home.

=> Tom wasn't allowed to take books home.

2) People say that he is intellegent.

=> He is said to be intelligent.

3) He can't repair my bike.

=> My bike can't be repaired.

4) Marry has operated Tom since 10 o'clock.

=> Tom has been operated by Mary since 10 o'clock.

5) They won't correct exercises tomorrow.

=> Exercises won't be corrected tomorrow.

6) She is running her ouin company.

=> Her ouin company is being runned.

7) Cows were eating grass on the meadow.

=> Grass was being eaten on the meadow by cows.

8) Tom is writting 2 poems.

=> 2 poems are being written by Tom.

\(a,\Leftrightarrow4x\le26244\\ \Leftrightarrow x\le6561\)

\(b,\Leftrightarrow4x\ge10\\ \Leftrightarrow x\ge2.5\)

\(c,\Leftrightarrow9x=12\\ \Leftrightarrow x=\dfrac{4}{3}\)

\(=\sqrt{2+2\sqrt{2}+1}\\ =\sqrt{\left(\sqrt{2}+1\right)^2}\\ =\sqrt{2}+1\)