\(\dfrac{7}{2.4.6}+\dfrac{7}{4.6.8}+...+\dfrac{7}{26.28.30}\)

Cho mình mỗi đáp án cũng được.

\(\left(5^{16}+16^5\right)\left(3^{17}-3^{10}\right)\left(2^4-4^2\right)\)

tính nhanh.

Làm tròn 3,25 đến chữ số hàng thập phân thứ nhất.

Tìm điều kiện xác định

\(\sqrt{x^2-2x+1}+\sqrt{x^2-6x+9}=1\)

\(\sqrt{x^2-2x+1}+\sqrt{x^2-4x+4}=3\)

\(\sqrt{x^2-2x+1}+\sqrt{x^2-4x+4}=3\)

1. They have provided the needy people with food and clothing

=> The needy people

2. "What do you think about this movie, Tom?" asked Mary

=> Mary asked

3. Think positive, and you will feel better than ever

=> If

4. It's over six months since John last had his hair cut

=> John hasn't

5. He is a worse dancer than Mary

=> Mary doesn't

6. He had a lot of trouble because of not preparing well for the trip

=> Because