tui

Comb : 1 hàng răng dài.

Brush : Nhiều hơn 1 hàng hoặc có hình tròn.

aren't I

shall we

will you

will he

isn't he

haven't they

shall we

Isn't it

Are they 

Isn't it

Can't they

Did they

Did it

Aren't I 

hadn't he

does he

have you

did they

isn't it

aren't they

will you

will you

did they

isn't it

don't you

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X=\(\left\{{}\begin{matrix}-\dfrac{8}{3}\\1\end{matrix}\right.\) 

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mình chưa kịp nghĩ cách giải!

X=-15 

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Mình chưa kịp nghĩ cách giải nha!

1 He is thought to have died a natural death

2 It is believed that 13 is an unlucky number

3 It is said that John is the brightest student in class

4 It was reported that the President had suffered a heart attack

5 It is believed that he owns a lot of supercars

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