A=x2 + 2xy - 3x2 + 2y2 + 3x2 - y2
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3 x 3 x 49 + 90 x 13 + 21 + 6
= 9 x 49 + 1170 + 27
= 441 + 1170 + 27
= 1611 + 27
= 1638
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1 Mark Twan was born in Missouri in 1835
2 The lesson is so difficult that nobody can understand it
3 A man who is called a tax collector collects taxes
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1. She was so lazy that she was punished by her teacher.
2. Alice started playing tennis 2 years ago.
3. My uncle is a famous stamp collector.
4. Can I meet you at between 8 am and 9 am?
5. Can you wait for me for a while?
1. She was so lazy that she was punished by her teacher.
2. Alice started playing tennis 2 years ago.
3. My uncle is a famous stamp collector.
4. Can I meet you at between 8 am and 9 am?
5. Can you wait for me for a while?
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các truyền thống : đoàn kết , tương thân tương ái, yêu nước, ..
các truyền thống : đoàn kết , tương thân tương ái, yêu nước, ..
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Aha! Câu trả lời chính xác nhất đó là con cá. Bây giờ bạn phải đưa tôi 5 coin đi!
Aha! Câu trả lời chính xác nhất là con cá. Bây giờ bạn phải đưa tôi 5 coin ngay đi!
`A= x^2+2xy-3x^2 +2y^2+3x^2-y^2`
`= (x^2-3x^2 +3x^2) +2xy +(2y^2 -y^2)`
`= x^2 +2xy +y^2`
`=(x+y)^2`
A = \(x^2\) + 2\(xy\) - 3\(x^2\) + 2y2 + 3\(x^2\) - y2
A = (\(x^2\)- 3\(x^2\) + 3\(x^2\)) + 2\(xy\) + (2\(y^2\) - y2)
A = \(x^2\) + 2\(xy\) + y2
A = (\(x\) + y)2