Bài 1: Biến đổi theo "Because of": 1.She can't work hard because she is very old. 2.He likes her because she is very beautiful. 3.He couldn't go to school because he was very poor. 4.I can't buy this because I don't have enough money. 5.He brok the wase because he was careless. 6.He failed the exam because he didn't learn the lesson carefully. 7.We can't go for a walk because it rains heavily. 8.He lejt the school because his life was herd. 9.She was happy because she was given a new bike. 10.I went to bed early because I felt tired.

Bài 1:

  ((x + sqrt(x) + 10)/(x - 9) - 1/(sqrt(x) - 3)) / (1/(sqrt(x) - 9)).

Đk: x>=0; x khác .

a) Rút gọn biểu thức M=A:B

Rầy xanh là loại sâu phá hoại chủ yếu của cây xoài, người ta dùng thuốc gì? A. Bassa B. Thiodan C.Karate D. Validan

Câu 3. Biết rằng hệ  có nghiệm duy nhất  thỏa mãn  khi  ( là phân số tối giản). Vậy  bằng:

A. .                                 B. .                                 C. .                                    D. .