Cho mạch điện trên hình 15.2, trong đó L là một cuộn cảm thuần, điện áp hai đầu mạch u_PQ = 60√2cos100πt (V), các điện áp hiệu dụng U_PN = U_NQ = 60V. Hệ số công suất của mạch là bao nhiêu?

Câu 10: Nguyên nhân chính làm cho Trái Đất có sự sống là do:

A.Trái Đất nằm ở vị trí thứ 3 trong Hệ Mặt Trời.

B.Trái Đất quay quanh Mặt Trời theo quỹ đạo hình elip.

C.Trái Đất có dạng hình cầu.

D.Trái Đất thuộc nhóm hành tinh có kích thước nhỏ trong Hệ Mặt Trời.

giúp mình với! ai đúng mik tick cho><

Câu 6: Tính giá trị biểu thức:

a, (115+35):15+200x6:8                           

b, 3075x(72:9)–897                                          c,19832:37+19464

d, 135540 : (9x4) + 57800 : 200                                e, 5625 – 5000 : (726 : 6 – 113)

g, abab : ab x 5 + 495 – 100                            h, 325512 : 33 – 7856

Câu 7: Tìm X

a, X x 15 + X x 13 = 560 x 45          b, X x 125 – X x 73 = 1196     c, (X + X x 2) : 34 = 504

246 : X + 34 : X = 5                360 : X – 126 : X = 6              2005 + X x 34 = 5337

58 x X – 934 = 6722               X : 1234 = 127 (dư 360)                   XX – 2X x 2 + 68 = 100

14968 – X x 5 = 4968      (X+2) + (X+2) + (X+2) = 42                     199 < X x 5 – 15< 201

 IV Put the verbs in brackets into the correct form.

1.     We ________________ (have) a staff meeting next Monday.

2.     Lisa ________________ (wear) her uniform every school day.

3.     What time ________________ (you/ meet) Mathew tomorrow?

4.     Tom and Mary ________________ (run) because they’re late for school.

5.     My father ________________ (not drink) coffee very often.

6.     I enjoy ________________ (read) books and ________________ (play) sports.

7.     Would you like ________________ (go) to the movies with me?

8.     I ________________ (not work) today. I’m on holiday.

9.     We ________________ (not want) to go to the movies tonight.

10.  A: What ________________ (Tony/ do) this Sunday?

            B: He ________________ (do) the gardening with his Dad. VI. Match the sentences.

READING

VII.     Choose the word which best fits each gap.

 Wickedly Wonderful is a small summer (1) ______ in the UK for children aged 6 to 13 years old. The children (2) ______ a week outdoors at the camp, making new friends and learning new activities (3) ______ having a lot of fun. (4) ______ the summer camp, they sail, horse ride, kayak, enjoy games on the beach and the beach (5)______, swim, surf, go crabbing and ride bikes. Children will enjoy holidays with Wickedly Wonderful, and (6) ______ are holidays that they will remember forever!

1.     a. term       b.course           c.camp             d. holiday

2.     a. take        b.spend            c.use    d. pass

3.     a. which     b.what c.where            d. while

4.     a. At          b. In     c.On    d. During

5.     a. firingcamp         b. campfire      c.firecamp       d.firingcamp

6.     a. this         b.that   c.these             d. those

​

1.     My kids spend hours chatting ______ the phone ______ their friends.

a.  at - with             b. on - to          c.to - with        d. in - about

2.     Could you turn the television ______? I want to watch the news.

a.  on          b. off   c.down            d. up

3.     My best friend ______ a round face and big eyes.

a.  have       b. has   c.is       d. gets

4.     My brother is really ______. He always does his homework.

a.  hard-working     b. serious         c.confident      d. patient

5.     When eating, most Vietnamese people hold chopsticks in their right ______.

a.  arm        b. leg   c. finger           d. hand

6.     Which do you prefer, straight hair or ______ hair?

a.  long       b. blonde         c. curly            d. thick

7.     The kids are ______ their tricycles around the playground.

a.  playing b. riding           c. taking          d. driving

8.     Norman is very shy, but his brother is ______.

a.  easygoing          b. calm            c.patient          d. outgoing

9.     ______ explain this grammar for me, please? ~ Sure.

a.  Can you             b. Could you please    c. Would you like        d. Would you mind

10.  Would you like to come for dinner tonight? - ______

a.  Yes, certainly.   b. I’d love to. Thanks. c. Not at all.   d. No, thanks.

11.  I know the __________ to the post office.

a.  book                              b. lunch                       c. walk                d. way

12.  His trick made me furious.

a.  extremely angry            b. hot              c. not very happy     d. too sad

13.  - Will you do me a favor?  - Yes __________ great pleasure.

a.  at                                    b. of                 c. with                d. in

14.  Can you __________ me a good French restaurant?

a.  recommend                    b. praise                       c. say about                  d. answer

15.  He will __________ his brother to the zoo with him.

a.  give                                b. take                         c. like                 d. catch

16.  Long is working in a bicycle firm. He __________ there since 1978.

a.  had worked                    b. has been working c. were working             d. was working

17.  She often hires the van to transport her goods.

a.  the heavy car                 b. the coach                 c. the small truck         d. the big motorbike 

18.  We shall __________ this package to our friend in Ho Chi Minh city,

a.  receive                           b. reply                        c. send                d. ask

33. The Jones __________ in that house for twenty years. They like it very much,

    a. are living                         b. were living              c. has lived             d. have been living 

Her factory went bankrupt and since then she has been out of work.

     a. unable to do                    b. disappointed  c. dissatisfied              d. unemployed

 IV Put the verbs in brackets into the correct form.

1.     We ________________ (have) a staff meeting next Monday.

2.     Lisa ________________ (wear) her uniform every school day.

3.     What time ________________ (you/ meet) Mathew tomorrow?

4.     Tom and Mary ________________ (run) because they’re late for school.

5.     My father ________________ (not drink) coffee very often.

6.     I enjoy ________________ (read) books and ________________ (play) sports.

7.     Would you like ________________ (go) to the movies with me?

8.     I ________________ (not work) today. I’m on holiday.

9.     We ________________ (not want) to go to the movies tonight.

10.  A: What ________________ (Tony/ do) this Sunday?

            B: He ________________ (do) the gardening with his Dad. ​