Giúp em với tí em phải nộp cho cô rồi
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16 tháng 9 2021
c: \(C=\left(x+y\right)^2-\left(x-y\right)^2\)
\(=\left(x+y+x-y\right)\left(x+y-x+y\right)\)
=4xy
d: \(D=\left(\dfrac{x}{2}-y\right)\left(\dfrac{x}{2}+y\right)=\dfrac{1}{4}x^2-y^2\)
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 tháng 7 2021
6B 7C 8D 9C 10C 11D 12D 13B 14A 16B 17A 18A 19B 20C 21A 22B 23D 24B 25A 26C 27B 28A 29D 30B 31D
1 tháng 7 2021
6B,7C,8D,9C,10C,11D,12D,13B,14A,16B,17A,18A,19B,20C,21A,22B,23D 24B,25A,26C,27B,28A,29D,30B,31D
1 tháng 7 2021
I.
1A 2D 3B 4C
II.
5D 6A 7B 8B
III.
9B 10B 11A
IV.
12A 13B 14A
15C 16B 17B 18A 19B 20C 21D 22C 23B 24D
Bài 1:
1B
2D
3E
4C
5A
6G
7F
2)
a) (3x+y)(9x2-3xy+y2)=27x3+y3
b) (2x-5)(4x2+10x+25)
c)(2a+3b)(4a2-6ab+9b2)
d)(5x-4y)(25x2+20xy+16y2)=125x3-64y3