2 It take more hours to travel by train than to travel

6 The bus run more frequently than the trains

5 That is the farthest distance i have ever run

6 It was the worst mistake I have ever made

5 That's the furthest (or farthest) I've ever run.

6 It is/was the worst mistake I've ever made.

5. That run .... ( mình ko hiểu đề )

6. It make the worst mistake

1. Đáp án C

2. Đáp án C ( $K_2O,BaO,CaO,CuO,Na_2O,Fe_2O_3,MgO,ZnO$ ) 

$Al_2O_3$ là oxit lưỡng tính

3. Đáp án Sục khói than qua dung dịch nước vôi trong để hấp thụ hết khí độc 

$CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O$
$SO_2 + Ca(OH)_2 \to CaSO_3 + H_2O$
$SO_3 + Ca(OH)_2 \to CaSO_4 + H_2O$

a: ĐKXĐ: \(x\ge\dfrac{2}{3}\)

b: Ta có: \(3\sqrt{2}-4\sqrt{18}+2\sqrt{32}-\sqrt{50}\)

\(=3\sqrt{2}-12\sqrt{2}+8\sqrt{2}-5\sqrt{2}\)

\(=-6\sqrt{2}\)

\(2.16\ge2^n>4\)

\(2.2^4\ge2^n>2^2\)

\(2^5\ge2^n>2^2\)

=> \(n\in\left\{3,4,5\right\}\)

Vậy: \(n\in\left\{3,4,5\right\}\)

ơ khoan '' The Mid - Second Term Test '' ? 

Giả sử Ax//By

Kẻ Ax//By//Oz

\(\Rightarrow\widehat{OAx}=\widehat{AOz}=50^0\)(so le trong)

Ta có: By//Oz

\(\Rightarrow\widehat{OBy}+\widehat{BOz}=180^0\)(trong cùng phía)

\(\Rightarrow\widehat{OBz}=180^0-150^0=30^0\)

Ta có: \(\widehat{AOB}=\widehat{AOz}-\widehat{BOz}=50^0-30^0=20^0\)

\(\Rightarrow x=20^0\)