HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
1. Her written work is excellent. She puts her ideas......... so well.
A. across
B. forward
C. on
D. out
2.Do you think that we'll find a solution....... this problem.
A. about
B.to
C. of
D. with
3. "Could I just do it right now?" - " ..................... "
A. Yes, you could
B. Not for me
C. Yes, let's
D. Why not? Go ahead
4. He goes to the restaurant now and ........
A. after
B. here
C. now
D. then
5. Some people............. sports in order to keep fit, not because they like them.
A. train
B. practice
C. make
D. do
6. I am sure that he didn't break your vase........... purpose.
A. in
B. with
C. for
D. on
7. My parents were so disappointed when I ........... college.
A. got out of
B. fell out of
C. dropped out of
D. moved out of
8. ......... at his lessons, he couldn't catch up with his classmates.
A. Hardly as he worked
B. Hard ad he worked
C. Hard as he does
D. Hard as he was
9. Our soccer team lost ........... three goals to nil.
A. with
B. by
C. to
D. in
Chúc bạn học tốt!
Đề bài có vấn đề, bạn xem lại.
EXERCISE 10: Change the acive into the passtive 1. They can't make tea with cold water
=> Cold water couldn't made tea. 2 . The cief engineer was instructing all the workers of the plant.
=> All the workers were instructed by the cief engineer of the plant. 3. Somebody has taken some of my books away.
=> My books have been taken away. 4 . They will hold the meeting before May Day.
=> The meeting will be holded before May Day. 5 . They have to repair the engine of the car.
=> The engine of the car had to repair. 6 . The boys broke the window and took away some pictures.
=> The window was broken and some pictures were taken away. 7. Since then people have seen him in 10 different countries.
=> He has been seen in 10 different countries.
CHÚ Ý: SAI ĐỀ BÀI! NẾU JACK TRONG CUỘC HỘI THOẠI KHÔNG CÓ HỎI LINDA THÌ VIỆC ĐỂ VẾ TRẢ LỜI CÂU HỎI CHO LINDA SẼ LÀ SAI HOÀN TOÀN, BẠN CHÚ Ý NHÉ!
Nếu dạng bài theo kiểu đánh số thì bạn tự soát lại, còn nếu chỉ chép lại đáp án thôi thì đây nhé (!):
Linda: This is a good photo. Where did you take it?
Jack: I didn't take it. My friend Molly took it at the Live 5 concert in London.
Linda: Live 5?
Jack: It was a charity concert. I didn't go, but I watched it on TV, it was amazing.
Linda: Did a lot of bands play?
Jake: Yes, they did.
Linda: Really? Can he sing? I didn't know that. (?)
Jack: He didn't sing. He made a speech about africa.
Ta có:
AH = sinB x 9 = 7,5 cm
BH = AB^2 = AH^2 = sqrt(81 - 56,25) = 4,9 cm
Ch = AC^2 - AH^2 = sqrt(144 - 24) = 10,9 cm
sinC = 4,9 : 12 = 0,4083
=> Góc C = 24 độ
=> Góc A = 180 - 57 - 24 = 99 độ
Câu c)
Gọi giao điểm EF và AH là O
Gọi giao điểm AM và EF là G
Ta có OA = OH = OE = OF (t/c hình chữ nhật)
=> OE = OH
=> Tam giác OEH cân tại O
Xét 2 tam giác OEH và OAF ta có:
Góc EOH = Góc AOF (đối đỉnh)
OE = OF OH = OA
=> 2 tam giác đồng dạng với nhau (c.g.c)
=> Góc AOF = Góc AFO
=> Tam giác OAF cân tại O
=> AG vuông góc EF.
Câu a)
Đổi 4sqrt(3) cm ra 6,9 cm.
Áp dụng định lý đảo của Pytago, ta có:
BC^2 = AB^2 + AC^2
<=> BC^2 = 4^2 + 6,9^2
<=> BC^2 = 16 + 47,61
<=> BC = sqrt(63,61)
<=> 8 = ~8 cm = VP
Vậy suy ra tam giác ABC là một tam giác vuông và là một tam giác vuông tại A.
Câu b)
Áp dụng tỉ số lượng giác trong tam giác vuông, ta có:
sinB = 6,9 : 8 = 0,8625
=> Góc B = 59,5 độ
sinC = 4 : 8 = 0,5
=> Góc C = ~30,5 độ
Áp dụng hệ thức lượng trong tam giác vuông, ta có:
BH = AB^2 : BC = 16 : 8 = 2 cm => CH = 6 cm
AH = sqrt(2 x 6) = 3,46 cm