= (9975+25)+(11970+30)+(13965+35)+(17955+45)+(19950+50)-(25+30+35+45+50)

= 10000+12000+14000+18000+20000-185

= 73815

=(9975+25)+(11970+30)+(13965+35)+(17955+45)+(19950+50)-(25+30+35+45+50)

= 10000+12000+14000+18000+20000-185

=73815

sai rồi kìa,đáng lẽ \(\dfrac{\sqrt{5}-1}{2}+1=\dfrac{\sqrt{5}+1}{2}\) chơ

C

Argentina

1.He stole some money and was arrested for it. 

=> He was …

2.I have to write letters, but I hate it. 

=> I hate …

3.John failed to find the source of the River Nile. 

=> John did not succeed …

4.If I had worked hard, I wouldn’t have failed the exam. 

=> Tom regretted ….

5.Henry denied stealing Mary’s handbag.

=> Henry said that …

6.We couldn’t drive because of the fog. 

=> The fog …

7.Richard reduced his intake of fatty food and lost seven kilos in a month!

    => Richard cut …

8.While mending the road, the accidentally blocked our water pipes. 

     => They accidentally cut off …

9.They always make fun of me and I hate it. 

=> I hate …

10.I don’t see the point of redecorating this room. 

=> Redecorating this room …

11.I’m always nervous when I take exams.

=> Taking …

12.Mrs. Scott is proud of her cooking. 

=> Mrs. Scott prides …

13.You can try to get Tim to lend you his car but you won’t succeed. 

     => There’s no point …

14.They were unable to finish their tennis game because of a heavy shower.

       => A heavy shower …

15.It’s not worth trying to make her change her mind.

=> There’s …

16.I’ll be happy to give you a lift. 

=> I don’t mind …

17.He was sorry didn’t say goodbye to her at the airport.

=> He regretted …

18.Why not go there by bus? 

=> Anne suggested …

19.You can try to get Jim to lend you his car, but you won’t succeed. 

=> There’s no point …

20.Why don’t you put your luggage under the seat? 

=> He suggested …

21.The driver said it was true that he didn’t have a licence. 

=> The driver admitted …

22.I hate to get up in the dark. 

=> I can’t …

23.Seeing Nelson Mandela will always in my memory. 

=> I’ll never …

24.We couldn’t drive because of the fog. 

=> The fog prevented …

25.I realized I had said something wrong. (conscious) 

=> …

26.Collecting stamps from foreign countries is one of Jane’s interests.

=> Jane …

27.He takes great delight in proving others wrong. (enjoys)

=> He ….

28.Reading scientific books is one of my interests.

=> I am …

29.The tram couldn’t run because of the storm. 

=> The storm …

30.My English friend finds using chopsticks difficult. 

=> My English friend isn’t …

chấp thằng mù,OK!!

a)Ta có:\(P=2\left|2x-5\right|+7\)

Do \(\left|2x-5\right|\ge0\Rightarrow2\left|2x-5\right|\ge0\Rightarrow P\ge7\)

Dấu "=" xảy ra <=> 2x-5=0<=>x=5/2

b)Do \(\left|x-7\right|\ge0\Rightarrow3\left|x-7\right|\ge0\Rightarrow Q\ge-4\)

Dấu '=' xảy ra <=> x-7=0<=>x=7

Ta có:\(A=\left(\dfrac{\sqrt{x}}{\sqrt{x}+2}-\dfrac{4}{x+2\sqrt{x}}\right):\left(1+\dfrac{1}{\sqrt{x}}\right)\)

             \(=\dfrac{x-4}{x\left(\sqrt{x}+2\right)}:\dfrac{\sqrt{x}+1}{\sqrt{x}}\)

             \(=\dfrac{\sqrt{x}-2}{x}.\dfrac{\sqrt{x}}{\sqrt{x}+1}=\dfrac{\sqrt{x}-2}{\sqrt{x}\left(\sqrt{x}+1\right)}\)