giúp mk với ạ . tĩ nưa mk nộp cho cô rồi ạ 
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giúp mk với ạ . mk cần rất gấp ạ . ngày mai 9h sáng mk nộp rồi ạ
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19 phút nữa mk nộp cho cô rồi ạ 
19 phút nữa mk nộp bài cho cô rồi ạ
29 tháng 8 2021
Bài 16:
a: Ta có: \(P=\left(\dfrac{\sqrt{a}+1}{\sqrt{ab}+1}+\dfrac{\sqrt{ab}+\sqrt{a}}{\sqrt{ab}-1}-1\right):\left(\dfrac{\sqrt{a}+1}{\sqrt{ab}+1}-\dfrac{\sqrt{ab}+\sqrt{a}}{\sqrt{ab}-1}+1\right)\)
\(=\dfrac{a\sqrt{b}-\sqrt{a}+\sqrt{ab}-1+ab+\sqrt{ab}+a\sqrt{b}+\sqrt{a}-ab+1}{\left(\sqrt{ab}+1\right)\left(\sqrt{ab}-1\right)}:\dfrac{a\sqrt{b}-\sqrt{a}+\sqrt{ab}-1-ab-\sqrt{ab}-a\sqrt{b}-\sqrt{a}+ab-1}{\left(\sqrt{ab}+1\right)\left(\sqrt{ab}-1\right)}\)
\(=\dfrac{2a\sqrt{b}+2\sqrt{ab}}{-2\sqrt{a}-2}\)
\(=\dfrac{2\sqrt{ab}\left(\sqrt{a}+1\right)}{-2\left(\sqrt{a}+1\right)}\)
\(=-\sqrt{ab}\)
SB
1 tháng 7 2021
theo mình trong 3-5 năm tới con ng cần các phẩm chất sau :
+ trung thực
+ tự tin
+ mạnh mẽ , dũng cảm
DT
Đỗ Thanh Hải
CTVVIP
1 tháng 6 2021
1 C
2 A
3 B
4 C
5 A
6 B
7 A
8 C
9 C
10 A
11 C
12 A
13 B
14 C
15 A
Bài 2
1 When
2 in case
3 since
4 although
5 before
6 as long as
7 as though
8 because
9 while
10 As long as
DT
Đỗ Thanh Hải
CTVVIP
3 tháng 6 2021
33 Now I don't go climbing as much as I used to when was younger
34 There used to be dreadful fogs in England
35 We haven't decorate the room for years
36 The other guests will start dinner before we arrive
37 I wish the school holidays were longer
38 He is too young to join the club
39 It's very necessary to blame him for his mistakes
40 It was obligatory for him to pass his itermediate level English examination
MN
3 tháng 6 2021
33. Now I don't go climbing as much as I used to when I was younger
34. There used to be dreadful fogs in England.
35. We haven't decorated the room for years.
36. The other guests will start dinner before we arrive.
37. I wish the school holidays were longer.
38. He is too young to join the club.
39. It's very necessary to blame him for his mistakes.
40. It was obligatory for him to pass his itermediate level English examination.
1 C
2 B
3 A
4 C
5 B
6 A
7 D
8 A
9 D
10 B
11 A
12 C
13 A
14 A
15 B
16 B
17 B
18 A
19 B
20 A
21 A
22 D
23 C
24 A
25 B
16 A
Câu 1: C
Câu 2: B
Câu 3: A
Câu 4: C