16 seeing

17 was sent

18 hadn't flied

19 being taken 

20 saw

21 had gone

22 were these photos taken

23 did we discovered

24 to tell

25 would have gone

26 be put

27 to concentrate

28 spoke

29 confused 

30 had he arrived

31 C

32 A

33 B

34 C

35 C

36 B

37 C

38 C

39 B

40 C

41 achivement

42 disappearance

43 popularity

44 passionate

45 opposition

Đề...

bạn ơi giúp j vậy bn!!???

Thế đề đâu bạn bị lỗi hả 

\(Q=x-2-2\sqrt{x-2}+4\)

\(=\left(\sqrt{x-2}-1\right)^2+3>=3\)

Dấu = xảy ra khi x=3

\(Q=x+2-2\sqrt{x-2} \)

\(Q=x-2-2\sqrt{x-2}+4 \)

\(Q=(\sqrt{x-2}-1)^2+3\)

Vì \((\sqrt{x-2}-1)^2\)\(\ge\)\(0\)

\(\Leftrightarrow\)\((\sqrt{x-2}-1)^2+3\)\(\ge3\)

Vậy GTNN Q=3

1: \(a^2-4b^2=\left(a-2b\right)\left(a+2b\right)\)

2: \(16a^2-b^4=\left(4a-b^2\right)\left(4a+b^2\right)\)

3: \(4a^4-81b^4=\left(2a^2-9b^2\right)\left(2a^2+9b^2\right)\)

1. Energy consumption will be reduced as much as possible.
2. A lot of energy next century will be offered by wind power.
3. In the past, clothes were washed with my mother's hand. ;-;
4. Their house is decorated with beautiful Christmas trees.
5. Ann will be invited to the party by Bill.

giúp j

đâu? giúp gì

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