Chủ đề:
Ôn tập hệ hai phương trình bậc nhất hai ẩnCâu hỏi:
Cho hệ phương trình : x + my= 1 và x + 2y=3
Tìm tất cả gt nguyên của m để hệ có nghiệm duy nhất mà x, y nguyên
Rewrite sentence
1.He has decided to immigrate to Australia, we can't stop him ( prevent)
We can't...
2.I didn't tell her the new because i didn't want to upset her ( so)
I didn't tell....
3.He couldn't get the credit card because he owed the bank money (result)
He owed the bank....
4.He bought a computer as he intended to work from home (view)
He bought
5.She seldom left the house because she was afraid of being attacked ( fear)
She seldom...
6 What ever I will never truth that man ( what)
I will never
7.She was tall but she couldn't rich the self ( though)
Tall..Rewrite sentence
1.He has decided to immigrate to Australia, we can't stop him ( prevent)
We can't...
2.I didn't tell her the new because i didn't want to upset her ( so)
I didn't tell....
3.He couldn't get the credit card because he owed the bank money (result)
He owed the bank....
4.He bought a computer as he intended to work from home (view)
He bought
5.She seldom left the house because she was afraid of being attacked ( fear)
She seldom...
6 What ever I will never truth that man ( what)
I will never
7.She was tall but she couldn't rich the self ( though)
Tall..
Bài 2. Cho tam giác ABC vuông tại A. Lấy điểm D thuộc cạnh AC ( D khác A,C) . Kẻ DE vuông góc BC tại E
a) Cm : CD.CA= CE.CB
b) cm : tam giác CDB đồng dạng với tam giác CEA
c) Gọi O là giao điểm của AE và BD. Chứng minh tam giác AOD đồng dạng tam giác BOE