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1:
a: \(=4x^2+4x+1-x^2-4x+5\)
\(=3x^2+6\)
b: \(=9x^2-24x+16+\left(2x-3\right)^2\)
\(=9x^2-24x+16+4x^2-12x+9\)
\(=13x^2-36x+25\)
c: \(=2\left(x^2-2x+1\right)-3\left(x^2+6x+9\right)+4x^2-1\)
\(=2x^2-4x+2-3x^2-18x-27+4x^2-1\)
\(=3x^2-22x-26\)
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1.A
2.A
3.B
4.C
5.B
6.C
7.A
8.A
9.B
10.A
11.B
12.A
13.C
14.B
15.B
16.A
17.A
18.A
19.A
20.C
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`1.` He writes well
`2.` What do these flowers cost?
`3.` He goes to Ha Noi by car.
`4.` Nam's hobby is planting trees.
`5.` He is good at cooking.
`6.` He is interested in playing games.
1 He writes well
2 What is the price of these flowers?
3 He goes to Ha Noi by car
4 Nam's hobby is planting trees
5 He is a good cook / He is good at cooking
5 He is interested in playing games
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Lục lạp là nơi chứa chất diệp lục, bào quan này giữ nhiệm vụ hấp thụ ánh sáng mặt trời để thực hiện quá trình quang hợp.
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- PTBĐ: nghị luận
- ND chính: Lối sống mang đậm văn hóa Việt Nam của chủ tịch Hồ Chí Minh
- Bài học:
+ Tích cực học hỏi để có vốn hiểu biết, am hiểu rộng rãi.
+ Giữ gìn những truyền thống tốt đẹp của dân tộc Việt Nam.
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Describing your(dream) school
My favorite school is a beautiful school. It is a big and large school. The school has many trees and there has enough stadiums and sporting yards for students to play. The thing I expect the most, that is a great learning school with many modern equipments. One more thing, the students of the school are friendly and helpful and the teachers are good too. That's all of the school in my dream.