1/Trong các số:\(\sqrt{\left(-5\right)^2}\);\(\sqrt{5^2}\);\(-\sqrt{\left(-5\right)^2}\);\(-\sqrt{5^2}\)căn bậc hai số học của 25 là...............

2/Kết quả nào đúng:A/0,15∈I , B/\(\sqrt{2}\in Q\) , C/\(\dfrac{3}{5}\in R\) , D/Ba kết quả trên đều sai

3/Tìm x,biết:a/\(-\sqrt{x}=\left(-7\right)^2\) b/\(\sqrt{x+1}+2=0\) c/\(5\sqrt{x+1}+2=0\) d/\(\sqrt{2x-1}=29\)

e/\(x^2=0,81\) g/\(\left(x-1\right)^2=1\dfrac{9}{16}\) h/\(\sqrt{3-2x}=1\) f/\(\sqrt{x}-x=0\)

4/Cho A=\(\dfrac{\sqrt{x}+1}{\sqrt{x}-1}\).CMR với x=\(\dfrac{16}{9}\) và x=\(\dfrac{25}{9}\) thì A có giá trị là số nguyên.

5/Tính:a/\(\sqrt{m^2}\) với \(m\ge0?\) b/\(\sqrt{m^2}\) với \(m< 0\)

6/Tính \(x^2\),biết rằng:\(\sqrt{3x}=9\)?

7/Tính:\(\left(x-3\right)^2\) biết rằng:\(\sqrt{x-3}=2\)?

8/Tính:a/\(2\sqrt{a^2}\) với \(a\ge0\) b/\(\sqrt{3a^2}\) với a<0 c/\(5\sqrt{a^4}\) với a<0 d/\(\dfrac{1}{3}\sqrt{c^6}\)với c<0

9/So sánh:A=\(\dfrac{25}{49}\) ; B=\(\dfrac{\sqrt{5^2}+\sqrt{25^2}}{\sqrt{7^2}+\sqrt{49^2}}\) ; C=\(\sqrt{\dfrac{5^2}{7^2}}\) ; D=\(\dfrac{\sqrt{5^2}-\sqrt{25^2}}{\sqrt{7^2}-\sqrt{49^2}}\)

10/Cho P=\(-2019+2\sqrt{x}\) và Q=\(0,6-2\sqrt{x+3}\) a/Tìm GTNN của P? b/Tìm GTLN của Q?

11/Cho B=\(\dfrac{\sqrt{x+1}}{\sqrt{x-3}}\).Tìm số nguyên x để B có giá trị là một số nguyên?

12/a/Trong các giá trị của a là \(3,-4,0,10,-5\) giá trị thỏa mãn đẳng thức\(\sqrt{a^2}=a\)

b/Trong các giá trị của a là \(2,-6,0,1,-5\) giá trị thỏa mãn đẳng thức \(\sqrt{a^2}=|x|\)

Kết quả nào sau đây đúng:

A.\(0,15\in I\)

B.\(\sqrt{2}\in Q\)

C/\(\dfrac{3}{5}\in R\)

D/Ba kết quả trên đều sai.

Tỉ số chiều dài và chiều rộng của một hình chữ nhật bằng \(\dfrac{3}{2}\).Nếu chiều dài tăng thêm 3 dơn vị thì chiều rộng của hình chữ nhật phải tăng thêm mấy đơn vị?

Đi đến giữa cầu và quay mặt ngược lại. Con gấu thức dậy tưởng ng đó từ bên kia qua nên rượt trở lại. Thế là ng đó đã qua dc cầu!

Read the text below and decide which answer A,B,C or D best fits each sppace.(Why)

When you are in Hong Kong,you can go about by taxi,by tram,by bus,or(1)________underground.I myself prefer the underground(2)________it is fast,easy and cheap.There are(3)_____trams and buses in Hong Kong,and one cannot drive along thr road(4)______and without many stops.The underground is therefore usually quicker(5)__________taxis or buses.If you do not know Hong Kong very well,it is very difficult(6)____________the bus you want.You can take a taxi,but it is(7)_______expensive than the underground or a bus.On the underground you find good maps that tell you the names of the stations and show you(8)________to get to them,so that it is easy to find your way.

1.A.in B.by C.on D.with

2.A.because B.when C.so D.but

3.A.some B.a lot C.many D.few

4.A.quick B.quicker C.quickly D.quickest

5.A.as B.than C.so D.like

6.A.finding B.to find C.found D.to finding

7.A.more B.much C.as D.too

8.A.who B.when C.what D.how

Fill in the blanks with suitable relative pronouns.

1.Do you know the girl________________________________I danced with?

2.Do you know the girl________________________________danced with me?

3.The apples_________________________________________are lying on the table are bad.

4.We will stay at a hotel________________________________is not far from the beach.

5.We will stay at a hotel________________________________my friend has recommend to us.

6.That is a museum____________________________________I like very much.

7.This is the man______________________________________Barbara visited in Scotland.

8.This is the man______________________________________lives in Scotland.

9.This is the picture____________________________________Jane painted.

10.Do you know the reason______________________________Jack uses the phone so long.

11.We ate the sweets___________________________________my mother had bought.

12.Is this the boy______________________________________plays the piano.

13.This is the house____________________________________was broken into.

14.That man is the writer________________________________wrote a best-selling novel.

15.Here is the CD______________________________________you through you had lost.

16.A proffesor is someone________________________________teaches in a university.

17.The only present_____________________________________I didn't like was the gold belt.

18.A meteorologist is someone____________________________knows about the weather.

19.This is the boy_______________________________________I wrote to you about.

20.Anybody____________________________________________wants to join the drama society must sign up now.

21.This is the boy________________________________________is so expensive.

22.Ciro's was the best club_________________________________I have ever been to.

23.The tower____________________________________________blew town in the storm was over years old.

24.The bed______________________________________________you slept last night is very comfortable.

25.I can't forget the date____________________________________my father die.

Hãy:Chứng minh rằng:AI//KB:

Tìm x,y,z:biết:\(\dfrac{x}{5}=\dfrac{y}{7}=\dfrac{z}{3}\)và \(x^2+y^2-z^2\)=585