1 Cho \(a,b\ge1\)

CMR \(a\sqrt{b-1}+b\sqrt{a-1}\le ab\)

1 Tìm GTLN của :

\(A=\sqrt{1-4x+4x^2}+\sqrt{4x^2-12x+9}\)

1 Tìm GTLN của :

a , \(A=\sqrt{x-2}+\sqrt{5-2x}\)

b , \(B=2\sqrt{x-1}+3\sqrt{5-x}\)

Give corect formation of these words .

1 . The air in the city is ............................ ( pollute )

2 . Please listen to the lecture ........................... ( care )

3 . An accident happened because of driving ............................. ( care )

4 . He was ........................... ( disappoint ) that they were not coming .

5 . Air and water .............................. ( pollute ) can make people fall ill.

6 . Plastic bags will cause ....................... ( pollute )

7 . Mr Brown is one of the ............................ ( conserve )

8 . We should make our world ........................ ( pollute )

9 . I'm ...................................... ( disappoint ) that you didn't do your homework .

10 . Listen me .................................... ( care ) you can solve the problem .

Hoàn thành bài nói chuyện của một tình nguyện viên của Quân đoàn Hòa bình với các hình thức chính xác của động từ trong hộp.

remember will be can stay can take join

" I came here two years ago because I wanted to teach people about modern health care . I will be leaving in about two months , I wish I ( 1 ) .......... longer , but it's time for me to go home .

1 . I don't want you to come to class late . ( would rather )

-> ......................................................................

2 . Ann passed her examination easily because of working hard .

-> Because Ann .......................................................................

3 . Because of the bad situation of the patient , he must have an operation immediately . ( so )

-> .......................................................................................................................

4 . It's a pity that the flight will be delayed for 2 hours . ( wish )

-> .........................................................................................

5 . The first time I've played tennis was ten years ago .

-> ...........................................................................

6 . I last spoke to Miss Lien last Friday .

-> ..................................................