giup mik vs
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27. unforgetable
câu 31 đổi thành ...if I can give him his guide....
câu 32 thiếu on trong turned on và đổi thành has been turned on vì câu gốc là HTHT
câu 33 rút gọn mệnh đề ok
câu 34 hơi phân vân nhưng mình thấy đúng
Câu 3:
a: Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:
\(\dfrac{x}{3}=\dfrac{y}{2}=\dfrac{x+y}{3+2}=\dfrac{90}{5}=18\)
Do đó: x=54; y=36
a) \(=x\left(x-y\right)+\left(x-y\right)=\left(x-y\right)\left(x+1\right)\)
b) \(=a^2\left(a-x\right)-y\left(a-x\right)=\left(a-x\right)\left(a^2-y\right)\)
c) \(=3\left(x^2+4x+4\right)=3\left(x+2\right)^2\)
d) \(=2\left(a^2-b^2\right)-5\left(a-b\right)=2\left(a-b\right)\left(a+b\right)-5\left(a-b\right)\)
\(=\left(a-b\right)\left(2a+2b+5\right)\)
e) \(=xy\left(x-y\right)-3\left(x^2-y^2\right)=xy\left(x-y\right)-3\left(x-y\right)\left(x+y\right)\)
\(=\left(x-y\right)\left(xy-3x-3y\right)\)
f) \(=x^2\left(x+5\right)-4\left(x+5\right)=\left(x+5\right)\left(x^2-4\right)\)
\(=\left(x+5\right)\left(x-2\right)\left(x+2\right)\)
\(3x\left(x-y\right)+x-y\)
\(=3x\left(x-y\right)+1\left(x-y\right)\)
\(=\left(x-y\right)\left(3x+1\right)\)
1 didn't
2 did
3 doesn't
4 does
5 don't
6 do
7 did
8 doesn't
1. a little
2. much
3. many
4. a few
5. many
6. much
7. a little
8. a few
k mik nha bn
II.
1. A
2. C
V.
1. Sue loves making origami. She can fold some animals, birds, and flowers.
2. I detested spending two hours every day traveling to work back.
3. He started softening the net hours ago. Has he stopped soft yet?
4. I tried hard to concentrate, but my mind kept wandering.
5. Tonight I'd like to go out, but I have to do my homework.
6. My father is not keen on coffee. He prefers drinking tea.
7. I am a little busy. Would you mind waiting a little longer?
8. Mobile games are great, but I don't like playing them for too long.
9. If I can choose, I prefer staying at home to playing sport.
10. Does she adore working with handicapped students?
bạn ơi bạn cần giúp bài nào