1.have read

2.don't know-tell

3.are you doing-are playing

4.used to play

5.is-is-is having

6.jogs

7.is coming

8.acting

9.to buy

10.stand

11.brushes

12.to take

13.am studying

14.to see

15.is-works-catches

16.is your father doing-is planting

17.smoked-smokes

18.helping

20.eating

21.have painted

22.watches

23.used

24.listens

Zoo is a place most people are familiar with and many have visited a zoo too. One visit to the zoo is enough to make you fall in love with nature and it’s beauty. When you visit a zoo, you learn so much about Mother Nature, the animals and birds that live in that habitat. There are always new things to learn about the animal kingdom.It’s the perfect place  to visit during a weekend is the Zoo. You should be careful while visiting a zoo. Please don’t try to feed any animals any edible substance to the animals. It may be harmful for them. There are a set of dos and don’ts outside every Zoo which educates the visitors about the same. Visitors can have a nice, pleasant, safe and enjoyable experience in the Zoo with the help of these instructions.One of the most don’ts in every Zoo is that adults and children shouldn’t try to feed anything to the animals. If people feed any substance to the animals, the animals may become seriously ill and sometimes die too.  Another important instruction that people should follow is that they should maintain distance from the barrier. Parents should especially follow this rule and keep their children away from the barriers.If you are having a bad day, you can visit the Zoo. It’s one of the most pleasant places to visit around you. It’s the closest you can get to the Mother Nature and the inhabitants of the nature. Zoos are the places to grow and nurture the species of the wild.

Đặt 4x²+36=k²\(\left(k>1,k\in N\right)\)

<=>(k-2x)(k+2x)=36

Mà \(k+2x\ge k-2x>0\) và k+2x,k-2x có cùng tính chẵn lẻ mà tích chẵn =>cùng chẵn

TH1.\(\left\{{}\begin{matrix}k+2x=6\\k-2x=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2k=12\\k+2x=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}k=6\\x=0\end{matrix}\right.\)

TH2.\(\left\{{}\begin{matrix}k+2x=18\\k-2x=2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2k=20\\k+2x=18\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}k=10\\x=4\end{matrix}\right.\)

1. to have

2.leaving

3.seeing-cry

4.to have

5.talking-to finish

6.to disappoint

7.to try-to come

8.looking

9.to do

10.driving-riding

11.going

12.to write

13.firing

14.gambling

15.falling

Với h=0 m thì \(W=W_đ=\dfrac{1}{2}mv^2=\dfrac{1}{2}.m.20^2=200m\)\(\)

Ta có:\(W_t=W_đ\Leftrightarrow W_t=\dfrac{1}{2}W\Leftrightarrow m.g.h=\dfrac{1}{2}.200m\Leftrightarrow10h=100\Leftrightarrow h=10\left(m\right)\)

32 tạ 5kg=3205 kg

She did want to buy a nlue hat

a)10x-x²-25=-(x²-10x+25)=-(x-5)²

Giả sử  có cùng chiều cao h

BC và EM là 2 đáy ứng với chiều cao 

Ta có:\(\dfrac{\Delta ABC}{\Delta DEM}=\dfrac{\dfrac{1}{2}BC.h}{\dfrac{1}{2}EM.h}=\dfrac{BC}{EM}\) (đpcm)

Giả sử  có cùng chiều cao h

BC và EM là 2 đáy ứng với chiều cao 

Ta có:\(\dfrac{\Delta ABC}{\Delta DEM}=\dfrac{\dfrac{1}{2}.BC.h}{\dfrac{1}{2}.EM.h}=\dfrac{BC}{EM}\)