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pvan211210
2 năm trước
Mn giải giúp bài này bằng cahcs giải hệ phương trình bằng máy tính casio nha Đề:Tổng số hạt cơ bản trong nguyênt ử X là 52.Biết số hạt không mang điện nhiều hơn số hạt mang điện trong hạt nhân là 1 đơn vị Tìm số p,n,e Nhớ là kết quả là từ giải hệ phương trình nha
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Tìm lỗi sai và sửa lại cho đúng: 1. After Mrs. Helen had returned (A) to her house (B) from work (C), she had been cooking (D) dinner. 2. Johnny kicked (A) the ball high (B) in the air, and Becky catching (C) it when (D) it came down. 3. Mary has worn (A) her new blue(B) trouser only once (C) since she buys (D) it. 4. Last month Harry told (A) me that he got (B) very bored with his present job and is looking (C) for a new one (D). 5. Having (A) fed the chickens, Kim was sat (B) down to (C) her own (D) meal. 6. When I turned on my computer, I was shocked (A) to find (B) some junk mail, and (C) I delete (D) it all. 7. They are going to have to (A) leave soon (B) and so do (C) we (D). 8. The boss laughed when the secretary has told (A) him that she really (B) needed (C) a pay (D) rise. 9. The telephone rang several times (A) and then (B) stop (C) before I could (D) answer it. 10. Debbie, whose father (A) is an excellent tennis player(B), has been (C) playing tennis since (D) ten years.

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