why don't + we / you + V nguyên mẫu ?

VI. WRITING 

1. Put the words in the correct order to make meaningful sentences.

1.  morning./My parents/in/go jogging/the park/ every

____________My parents go jogging in the park every morning_____________________________________________________

2.  in the town/Do/live/you/in the big city?/or

  ________Do you live in the town ỏ in the big city _________________________________________________________

3.  A village/ doesn’t have/ and it/ is/ in the countryside/a lot of houses.

. ______________A village doesn't have a lot of houses and it is in the countryside.___________________________________________________

4.  of/ reading?/books/ What/ do/ kinds/ you/ like 

______________What kinds òf books do you like reading___________________________________________________

5.  is/ favorite/ chess/ activity./ indoor/ my/ Playing

_______________Playing chess is my favurite indoor activity__________________________________________________

6.  Our/ short/ has/ hair/ is/ brown/ teacher/ and/ long

_________________________________________________________________

7.  wearing/ She/ blue T-shirt/ is/ jeans/ a/ and/.

_________________________________________________________________

The meeting will be hold before the May day

This room may be used for the classroom

Milk is used for making butter and chesse

We have been taught French bt Mr smith for 2 years

The machine mustn't be used after 5:30pm

My family has 6 people

My mother is a English teacher at this school

Why doonwe play tug of war afterschool

My sister is good a painting pictures

\(ĐK:x\ne\pm\dfrac{3}{2}\\ PT\Leftrightarrow2x+3+2x-3=2x+4\\ \Leftrightarrow2x=4\Leftrightarrow x=2\left(tm\right)\)

Đặt \(d=ƯCLN\left(2n+1,9n+4\right)\)

\(\Rightarrow\left\{{}\begin{matrix}2n+1⋮d\\9n+4⋮d\end{matrix}\right.\Rightarrow9\left(2n+1\right)-2\left(9n+4\right)⋮d\\ \Rightarrow18n+9-18n-8⋮d\\ \Rightarrow1⋮d\Rightarrow d=1\)

Vậy chọn B

\(a,ĐK:x>0;x\ne1\\ b,B=\dfrac{x+\sqrt{x}}{\sqrt{x}\left(\sqrt{x}-1\right)}=\dfrac{\sqrt{x}\left(\sqrt{x}+1\right)}{\sqrt{x}\left(\sqrt{x}-1\right)}=\dfrac{\sqrt{x}+1}{\sqrt{x}-1}\\ c,B=\dfrac{\sqrt{x}-1+2}{\sqrt{x}-1}=1+\dfrac{2}{\sqrt{x}-1}\in Z\\ \Leftrightarrow\sqrt{x}-1\inƯ\left(2\right)=\left\{-2;-1;1;2\right\}\\ \Leftrightarrow\sqrt{x}\in\left\{2;3\right\}\left(x>0\right)\Leftrightarrow x\in\left\{4;9\right\}\left(tm\right)\)

\(n_{Na_2O}=\dfrac{31}{62}=0,5(mol)\\ a,Na_2O+H_2O\to 2NaOH\\ \Rightarrow n_{NaOH}=1(mol)\\ \Rightarrow C_{M_{NaOH}}=\dfrac{1}{0,5}=2M\\ b,2NaOH+H_2SO_4\to Na_2SO_4+2H_2O\\ \Rightarrow n_{H_2SO_4}=0,5(mol)\\ \Rightarrow m_{dd_{H_2SO_4}}=\dfrac{0,5.98}{20\%}=245(g)\\ \Rightarrow V_{dd_{H_2SO_4}}=\dfrac{245}{1,14}=214,91(ml)\)

\(\Rightarrow6\left(b+3\right)+17⋮b+3\\ \Rightarrow b+3\inƯ\left(17\right)=\left\{-17;-1;1;17\right\}\\ \Rightarrow b\in\left\{-21;-4;-2;14\right\}\)

\(n_{Al}=\dfrac{3,24}{27}=0,12(mol)\\ 4Al+3O_2\xrightarrow{t^o}2Al_2O_3\\ Al_2O_3+6HCl\to 2AlCl_3+3H_2O\\ \Rightarrow n_{Al_2O_3}=0,06(mol)\Rightarrow n_{AlCl_3}=0,12(mol)\\ \Rightarrow m=m_{AlCl_3}=0,12.133,5=16,02(g)\)