\(CuO+H_2\underrightarrow{^{t^0}}Cu+H_2O\)

=> Phản ứng thế

\(CaO+H_2O\rightarrow Ca\left(OH\right)_2\)

=> Phản ứng hóa hợp

\(Cu\left(OH\right)_2\underrightarrow{^{t^0}}CuO+H_2O\)

=> Phản ứng phân hủy

\(3Fe+2O_2\underrightarrow{^{t^0}}Fe_3O_4\)

=> Phản ứng hóa hợp

\(2KClO_3\underrightarrow{^{t^0}}2KCl+3O_2\)

=> Phản ứng phân hủy

\(Ba+2H_2O\rightarrow Ba\left(OH\right)_2+H_2\)

=> Phản ứng thế

\(Mg+2HCl\rightarrow MgCl_2+H_2\)

=> Phản ứng thế

1 had worked - went - is travelling

2 do you do - worked

3 had gone

4 got - had gone

5 met - hadn't seen

6 was making

7 is having

8 is making - makes

9 am wearing

10 is reading

11 borrows - remembers

12 is he doing - think - is polishing

13 saw - was painting

14 was reading

15 went 

16 was discovered

17 drinks - drank

18 does she do - plays - watches

19 are waiting 

20 had left

23 Has Nga read

24 Have they played

25 Have - already washed

26 Is -travelling

7 makes

8 started

9 are - are playing

has nga read

have they played

have ....already washed

Is ....travelling

is always making

started

are-are playing

cái này áp dụng hệ thức lượng thôi bạn

AH=căn 6^2-4,8^2=3,6cm

=>AC=6^2/3,6=10cm

1. bag

2. bunch

3. slice

4. box

5. piece

6. carton

7. can

8. bowl

9. jar

10. bottle

o.nhìn.rõ