2 B

3 D

4 A

5 B

6 D

7 C

8 A

9 D

10 A

11 B

12 C

13 A

14 C

15 C

II 

1 majestic

1 C

2 A

3 C

4 D

5 D

6 B

7 B

8 C

9 C

10 B

10 C

12 A

13 A

14 A

15 C

16 B

17 D

18 B

19 B

20 A

21 A

22 B

23 A

24 C

25 A

1. C

2. A

3. C

4. D

5. D

6. B

7. B

8. C

9. C

10. B

11. B

12. A

13. A

14. A

15. C

16. B

17. D

18. B

19. B

20. A

21. A

22. B

23. A

24. C

25. A

❤ HOK TT ❤

2 Without his sister's help, John couldn't have done his homework

3 Instead of driving to work, I go by bus today

4 Mai doesn't mind giving you a hand

5 They don't know much about English

6 The noise prevented him from sleeping

7 The police have investigated the case for a week

8 We never had an intention of travelling abroad

9 Mary is believed to get the scholatship

10 Instrad of slowing down, he drove faster

1B

2A

3B

4D

5B

6C

7D

8B

9C

10A

11C

12D

Cái đấy ko thuộc trong chương trình lớp 7 đâu bạn!!Phải các anh chị lớp 8,9 mới giải đc!!!!!

\(C=\dfrac{3}{4}-\dfrac{3}{2}+0.5\cdot\dfrac{12}{5}-\left(-\dfrac{1}{2}\right)^2\)

\(=\dfrac{3}{4}-\dfrac{6}{4}+\dfrac{1}{2}\cdot\dfrac{12}{5}-\dfrac{1}{4}\)

\(=-1+\dfrac{6}{5}=\dfrac{1}{5}\)

3:

a: Xét ΔABD và ΔAED có

AB=AE

góc BAD=góc EAD

AD chung

=>ΔABD=ΔAED

=>DB=ED

b; Xét ΔDBK và ΔDEC có

góc DBK=góc DEC

DB=DE

góc BDK=góc EDC

=>ΔDBK=ΔDEC

c: AB+BK=AK

AE+EC=AC

mà AB=AE; BK=EC

nên AK=AC

=>ΔAKC cân tại A

d: ΔAKC cân tại A

mà AD là phân giác

nên AD vuông góc KC