Tìm điều kiện để biểu thức có nghĩa:

Cho \(\Delta ABC\), trung tuyến AM. G là trọng tâm. Một đường thẳng đi qua G cắt AB, AC, BC thứ tự tại I, K, H. Kẻ BE // CF // IK (E, F ϵ AM)

Chứng minh AE + AF = 2AM

Giải phương trình \(3x^2-7x-4=0\)

Giải phương trình: $3x^2-7x-4$ = 0

Giải phương trình: \(3x^2-7x-4\) = 0

1. We collect stationery because we want to help poor children.

2. This dish is made from meat and vegetables.

3. We are going to put "paint for people" on our poster.

4. We can hold an art show to raise money for street children.

Bài 6

1. provide aid

2. put out the forest fire

3. were taking shelter

4. scattered debris

5. evacuate the village

1. This aircraft is capable of accommodating 120 passengers.

2. This province is hit by storms at least twice a year.

3. Jake is taking charge of the office since his brother has left for Dublin.

4. These problems must be solved before it was too late.

5. All the students are prepared for the National Exams.