\(A=\sqrt{45-2\sqrt{135}+3}-3\sqrt{5}+3\sqrt{2}\\ =\sqrt{\left(3\sqrt{5}-\sqrt{3}\right)^2}-3\sqrt{5}+3\sqrt{2}\\ =3\sqrt{5}-\sqrt{3}-3\sqrt{5}+3\sqrt{2}\\ =3\sqrt{2}-\sqrt{3}\)

37 + (-5b) = -20 

-5b = -20 - 37 = -57

-5b = -57

Vậy b = 7     

4: cep → cap

Was there a school across from the theater?

=> Yes, there was.

=> No, there wasn't.

1: turtise → turtle

2: irase ( động từ ) → raise

3: penpel → pen pal

4: cep →

5: sawing machine → sewing machine

\(B=\sqrt{x-2-2\sqrt{x-2}+1}+1+\sqrt{x-2}\\ =\sqrt{\left(\sqrt{x-2}-1\right)^2}+1+\sqrt{x-2}\\ =\sqrt{x-2}-1+1+\sqrt{x-2}\\ =2\sqrt{x-2}\)

1, cheaper / is / than / The black car / the red one

=> The black car is cheaper than the red one.

2, tall trees / the city's / around / There are / main / stadium

=> There are tall trees around the city's main stadium.

3, you / Which / in? / class / are

=> Which class are you in?

4, and / the cinema / Is / the back? / between the hotel

=> Is the cinema between the hotel and the bank?

5, from / do / you / want / What / the bank?

=> What do you want from the bank?

6, My sister ( practice ) ....... the guitar twice a week.

=> practices

7, Don't worry . I ( go ) ....... fishing with you next Saturday.

=> will go

8, They ( give ) ....... a party next week.

=> are going to give

9, The members of the stamp collectors club ( meet ) ...... at the library next Friday.

=> are going to meet

10, I ( see ) ....... a film this Sunday evening ....... (you / go ) with me?

=> am going to see/ Will you go

\(A=\dfrac{\left(5\sqrt{3}+5\sqrt{2}\right)\left(5-2\sqrt{6}\right)}{5\sqrt{3}-5\sqrt{2}}\\ =\dfrac{5\left(\sqrt{3}+\sqrt{2}\right)\left(3-2\sqrt{6}+2\right)}{5\left(\sqrt{3}-\sqrt{2}\right)}\\ =\dfrac{\left(\sqrt{3}+\sqrt{2}\right)\left(\sqrt{3}-\sqrt{2}\right)^2}{\sqrt{3}-\sqrt{2}}\\ =\left(\sqrt{3}+\sqrt{2}\right)\left(\sqrt{3}-\sqrt{2}\right)\\ =3-2\\ =1\)

Vậy \(A=1\)