a: Xét ΔMEN có ME<MN+NE

b: ME<MN+NE

=>ME+EP<MN+NE+EP=MN+NP

Câu 7: D

Câu 8: B

Câu 9: B

1,D

2,B

3,B

7: D

 8: B

 9: B

pặn bị bắt kóc hẻ :) ?

🙂??

ảnh lỗi rồi !

cần chi tiết ko bạn

hay mỗi đáp án nhợ

Ta có:\(\sqrt{14-2\sqrt{33}}\)=1,584573983

\(\sqrt{33-4\sqrt{33}}\)=3,165714677

=>1,584573983\(-\)3,165714677=-1,581140694

nhé bạn

Câu 18: A

Câu 19: C

Câu 20: A

(-5)³.\(x^2\) = - 1125

        \(x^2\) = (-1125) : (-5³)

        \(x^2\) = 9

         \(\left[{}\begin{matrix}x=-3\\x=3\end{matrix}\right.\)

Vậy \(x\) \(\in\) {-3; 3}

\(\left(-5\right)^3.x^2=-1125\)

\(x^2=-1125:\left(-5\right)^3\)

\(x^2=-1125:\left(-125\right)\)

\(x^2=9\)

\(x^2=3^2\)

\(\Rightarrow\left\{{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)

⇒ Vậy \(x\in\left\{{}\begin{matrix}3\\-3\end{matrix}\right.\)

what ? 

1 lived 

2 wasn't hearing - was thinking

3 walked - was

4 were you doing - phoned

5 was reading - heard

6 was walking - saw

7 had watched - wrote

8 met

9 had you done - moved

10 was - didn't attend

II

1 when we were having lunch

2 had read the instruction, I started the machine

3 went out for a rest, we had finished our assignment

4 she left, it was raining

5 learning English

6 to help me

7 the man to open the briefcase

8 my friend break the bottle

9 him fall off the bike

10 a foreign language in a short time is not easy

em chưa học đến cái đó xin lỗi chị nhìu nha ;-;

6. pay you back on Saturday.

7. I close the door?

8. have a drink?

9. you help me with math problem?

10. stop making noise, please? the baby is sleeping.