A=\(\sqrt{\dfrac{x-y}{2}}\left(\sqrt{x+\sqrt{x^2-y^2}}-\sqrt{x-\sqrt{x^2-y^2}}\right)\)

Rút gọn biểu thức A với x \(\ge y\ge0\)

2)Tính giá trị của A khi x=\(\sqrt[3]{2\sqrt{13}+5}\) và y= \(\sqrt[3]{2\sqrt{13}-5}\)

A=\(\dfrac{x^2+\sqrt{x}}{x-\sqrt{x}+1}-\dfrac{2x+\sqrt{x}}{\sqrt{x}}+1\)

a)Rút gọn A

b)Biết x>1 hãy so sánh A với \(|A|\)

Cho biểu thức :

A=\(\left(\dfrac{\sqrt{a}}{\sqrt{a}-1}-\dfrac{1}{a-\sqrt{a}}\right):\left(\dfrac{1}{\sqrt{a}+1}+\dfrac{2}{a-1}\right)\)

a) tìm ĐKXĐ

b)Rút gọn

Rút gọn:

a)\(\dfrac{2}{\sqrt{3}}+\dfrac{\sqrt{2}}{3}+\dfrac{2}{\sqrt{3}}.\sqrt{\dfrac{5}{12}-\dfrac{1}{\sqrt{6}}}\)

Rút gọn:

a)\(\sqrt{6+2\sqrt{2}.\sqrt{3-\sqrt{\sqrt{2}+\sqrt{12}+\sqrt{18-\sqrt{128}}}}}\)

Chia động từ:

1.At school,we (study) two foreign languages.But now I study only E

2.A young lady (leave) this note for you ten minutes ago.As you (have) breakfast,I (not disturb) you at the time

3.I (know) Miss H for several years.I (read) her lastest novel,but I (not finish) it yet

4.This is the third time you (be) here.What exactly you (come) for now?

5.As a boy,I always (read) I always (have) my nose in a book

WORD FORMATION

1.He bowed to the small girl with elaborate (courteous)

2.The new an pair proved to be quite different from the family's (expect)

3.The scientific explanation was too difficult for me.I was quite out of my (deep)

4.He was bound hand and foot and so was (power) to escape

5.It is thoroughly dishonest and (honour) to cheat in an examination

6.In the event of floods,earthquakes and other disasters,(supply)can be flown immediately to those in need

7.Indeed,it is almost(possible) for the young person today to imagine a world without the aeroplane

Tìm chỗ sai và sửa:

1.She held fast to the chair and refuse to move

2.Since you paid for the theater tickets,please let me paid for our dinner

3.As Anna has a job,she is able to pay her rent and provided food for her family

4.It is important that students attending all the lectures

Viết lại câu:

1.She feels uncomfortable when people tell her how beautiful she is (embarrasses)

=>It

2.The boss likes to make people feel embarrased in front of others (humiliate)

=>The boss likes