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6 tháng 11 2021

11 He wishes he had finished washing my car

12 I wish I could draw well

13 I wish I would come to your party

14 She wish her father were a doctor

15 I wish I didn't have too many mistakes in my test

16 He wishes he didn't come late

17 I wish we didn't depend on my parents

18 I wish my pen pal would visit me next week

19 I wish there were some hotels in our village

20 I wish I had time to get to know your .....

6 tháng 11 2021

mù TA :>

26 tháng 6 2021

2 The meeting will be held before May Day

3 The engine of the car has to be repaired

4 A story is going to be told by the teacher

5 The cake is being cut with a sharp knife by Mary

6 Luckily for me, my name wasn't called

7 His story isn't believed

8 After class, the chalk board is always erased by one of the students

9 The victims have been provided with food and drink

11 Each of us were given 2 exercises books

12 He will be told that news

13 A lot of money was paid me to do the job

14 The window of the laboratory has been changed

15 tháng 11 2021

C

C

B

A

C

A

15 tháng 11 2021

cảm ơn nhiều

 

9 tháng 2 2022

25. cleverer nhé (of the 2_ 27. C 29. C (help someone to do/ do sth) 30. D

are saving-are going to buy 

listening - reading 

are sleeping 

makes

will not rain

does not go

to travel

laughing 

less => fewer 

lately=> late 

does it cost => it costs 

are => is

four-hours => four-hour

proud 

actress

older

 

9 tháng 2 2022

II

a)are saving/will buy

b) listening/reading

c)are sleeping

d)makes

e)won't rain

f) isn't going 

g)to travel

h)laughing

22 tháng 1 2022

a) \(Mg\left(OH\right)_2\) - Magie hidroxit

    \(MgCl_2\)       - Magie clorua

    \(MgS\)          - Magie sunfua

    \(Mg_3\left(PO_4\right)_2\) - Magie photphat

    \(Mg\left(HCO_3\right)_2\)  - Magie bicacbonat

 

22 tháng 1 2022

bạn ơi, bạn có thế giúp mình các ý còn lại đc ko

 

a: Thay x=0 và y=5 vào (d), ta được:

m*0+5=5

=>5=5(đúng)

=>ĐPCM

b: x1<x2; |x1|>|x2|

=>x1*x2<0

PTHĐGĐ là:

x^2-mx-5=0

Vì a*c<0

nên x1,x2 luôn trái dấu

=>Với mọi m

1 tháng 12 2021

Câu 10: 

\(a,Fe_2O_3+3CO\rightarrow\left(t^o\right)2Fe+3CO_2\\ b,2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ c,2Na+H_2SO_4\rightarrow Na_2SO_4+H_2\\ d,2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\\ Fe\left(OH\right)_2+2HCl\rightarrow FeCl_2+H_2O\\ Fe_2\left(SO_4\right)_3+BaCl_2\rightarrow FeCl_2+BaSO_4\left(PTHH.Sai\right)\\ 2Al+3CuSO_4\rightarrow Al_2\left(SO_4\right)_3+3Cu\\ 2Al+3MgO\rightarrow\left(t^o\right)Al_2O_3+3Mg\\ 2Al+3Cl_2\rightarrow\left(t^o\right)2AlCl_3\)

1 tháng 12 2021

Câu 8,9 đã làm!

Câu 7:

\(\text{Đ}\text{ặt}:N_xO_y\left(x,y:nguy\text{ê}n,d\text{ươ}ng\right)\\ V\text{ì}:\dfrac{m_N}{m_O}=\dfrac{7}{20}\\ \Leftrightarrow\dfrac{14x}{16y}=\dfrac{7}{20}\\ \Rightarrow\dfrac{x}{y}=\dfrac{7.16}{20.14}=\dfrac{2}{5}\\ \Rightarrow x=2;y=5\\ \Rightarrow CTHH:N_2O_5\)

26 tháng 11 2021

a) \(d\dfrac{CH_4}{kk}=\dfrac{M_{CH_4}}{M_{kk}}=\dfrac{16}{29}< 1\)

⇒ \(CH_4\) nhẹ hơn kk

b) \(d\dfrac{N_2O}{kk}=\dfrac{M_{N_2O}}{M_{kk}}=\dfrac{44}{29}=1,52>1\)

⇒ \(N_2O\) nặng hơn kk

28 tháng 11 2021

Câu b hỏi khí F2. Có hỏi không khí đâu??

15 tháng 11 2021

\(15\left(\dfrac{m.}{s}\right)=54\left(\dfrac{km}{h}\right)\)

\(\Rightarrow v_{tb}=\dfrac{s}{\dfrac{\dfrac{1}{2}s}{v'}+\dfrac{\dfrac{1}{2}s}{v''}}=\dfrac{s}{\dfrac{s}{36}+\dfrac{s}{108}}=\dfrac{s}{\dfrac{4s}{108}}=\dfrac{108}{4}=27\left(\dfrac{km}{h}\right)\)

\(TBCv_1-v_2=\left(18+54\right):2=36\left(\dfrac{km}{h}\right)\)

\(\Rightarrow v_{tb}< TBCv_1-v_2\left(27< 36\right)\)

Vậy ta đc đpcm.