Cho hbh ABCD tâm O: Tính
a, \(\overrightarrow{AB}\) + \(\overrightarrow{BC}\)
b, \(\overrightarrow{AC}+\overrightarrow{DA}\)
c. \(\overrightarrow{AB}+\overrightarrow{CD}\)
d. \(\overrightarrow{AB}+\overrightarrow{OA}\)
e, \(\overrightarrow{AB}+\overrightarrow{AD}\)
f, \(\overrightarrow{OA}+\overrightarrow{OC}\)
G. \(\overrightarrow{OA}+\overrightarrow{OB}+\overrightarrow{OC}+\overrightarrow{OD}\)
h. \(\overrightarrow{DA}+\overrightarrow{DC}+\overrightarrow{BD}\)
II Make questions from the underlined words or phrases
1. I'm taking French this semester
2. He is worried about the next examination
3. I like English very much
4. We began to study English six years ago
5. Last night I went to a disco with my friend
6. Tran could swim when she was seven
1. You shouldn't spend all your time.......
A. Study B: To study C: studying D studied
2. Would on like........somewhere for a rest ?
A. going B: to go C: go D: to be gone
3. I didn't like it in the city at first. But now.......here
A: I got used to living B I''m used to living C: I'm used to live D I used to live
Complete the conversations. Put in a to-infinitive or an in-form
1 A. Tom seems to enjoy watching football matches
B . yes, he loves........manchester united play
2 A. Do you think they'll approve the plan ?
B . yes, I'm quite sure they'll decide.....it
3. Do you want to come with me or wait here
I'd prefer......with you if that's OK
4 You wear a uniform at school, don't you ?
Yes, I have to, although I dislike.........it
5. I'm glad I don't work as late as Sarah does
Me too. I wouldn't like........such long hours
6. Have ICM bought the company ?
Well, they've offered....it
7. How long have you been working here ?
For about three years. But now I need a new job. I can't stand....here any more
8 What time will you be back ?
Oh, I expect.......back some time around nine
9. I'm sorry you had to wait all that time
Oh, it's all right. I don't mind
A. Cu; B. CuO ; c. MgCO3 ; D. Mg ; E. MgO.
a) Chất nào tác dụng với dung dịch HCl hoặc H2SO4 loãng, sinh ra
1. chất khí cháy được trong không khí ?
2.chất khí làm đục nước vôi trong ?
3. dung dịch có màu xanh lam ?
4. dung dịch không màu và nước ?
b) Chất nào không tác dụng với dung dịch HCl và axit sunfuric loãng ?