1. They said: "We are students in this school."

-> They said that they were students in that school.

2. She said: "We have finished our work."

-> She said that they had finished their work.

3. He said: "I like my uncle."

-> He said that he liked his uncle.

4. Lan asked Nam: "Where do you live?"

-> Lan wondered that where Nam lived.

5. The teacher asked us: "What are you doing now?"

-> The teacher wanted to know what we were doing then.

1. He said to me: "I shall be here with you tomorrow."

-> He told me that he should be there with me the following day.

2. I asked her: "Do you drink coffee?"

-> I wondered that if she drank coffee.

3. Ba said to his friend: "When will we go fishing?"

-> Ba asked his friend when they would go fishing.

4. The plumber said to Mrs. Thu: "You must pay me ten thousand dongs."

-> The plumber told Mrs. Thu that she had to pay him ten thousand dongs.

5. Marry said: "Do you feel well, John?"

-> Marry wondered that if John felt well.

6. "Would you please lend me your pen?" Trang asked Nam.

-> Trang asked Nam if he would lend her his pen.

7. My mother said to me: "You should do your homework every day."

-> My mother advised me to do my homework every day.

1. The teacher asked us: "Sit down, please"

-> The teacher asked us to sit down.

2. The doctor said to him: "Don't smoke cigarettes here"

-> The doctor reminded him not to smoke cigarettes there.

3. He said to her: "How beautiful your shirt is."

-> He exclaimed that how beautiful her shirt was.

4. She asked them: "Did you go to school yesterday?"

-> She wanted to know if they had gone to school the previous day.

5. She said to her: "I want you to go with me next week."

-> She told me that she wanted me to go with her the next week.

Bài I:

a) \(9x+17=6\sqrt{8x+1}+4\sqrt{x+3}\)   ĐKXĐ: x>=\(\dfrac{-1}{8}\)

\(< =>9x+17-6\sqrt{8x+1}-4\sqrt{x+3}=0\\ < =>\left(8x+1-2\sqrt{8x+1}.3+9\right)+\left(x+3-2\sqrt{x+3}.2+4\right)=0\\ < =>\left(\sqrt{8x+1}-3\right)^2+\left(\sqrt{x+3}-2\right)^2=0\\ < =>\left\{{}\begin{matrix}\sqrt{8x+1}=3\\\sqrt{x+3}=2\end{matrix}\right.< =>\left\{{}\begin{matrix}8x+1=9\\x+3=4\end{matrix}\right.< =>\left\{{}\begin{matrix}x=1\\x=1\end{matrix}\right.< =>x=1}}}\)

bạn ơi câu 2 bài 1 mik có thể đổi thành +2y^{2 _{được không}}

Cho đường tròn tâm O có hai đường kính là AB và CD vuông góc với nhau tại O. Trên cung nhỏ BC lấy điểm M, AM cắt CD tại I. Tiếp tuyến của O tại M cắt tia AB tại N. Chứng minh rằng: AC là tiếp tuyến của đường tròn ngoại tiếp tam giác CMI.

Cho parabol (P): y=ax²(a khác 0) đi qua điểm A(2;4). Tìm trên parabol các điểm cách O một khoảng bằng \(\sqrt{5}\) 

\(\sqrt{x-4\sqrt{x-1}+3}+\sqrt{x-6\sqrt{x-1}+8}=1\\ < =>\sqrt{x-1-2\sqrt{x-1}.2+4}+\sqrt{x-1-2\sqrt{x-1}.3+9}=1\\ < =>\sqrt{\left(\sqrt{x-1}-2\right)^2}+\sqrt{\left(\sqrt{x-1}-3\right)^2}=1\)ĐK: x>=1

\(< =>|\sqrt{x-1}-2|+|\sqrt{x-1}-3|=1\\ < =>\left(\left|\sqrt{x-1}-2\right|+\left|\sqrt{x-1}-3\right|\right)^2=1\\ < =>\sqrt{x-1}-2+2\left|\left(\sqrt{x-1}-2\right)\left(\sqrt{x-1}-3\right)\right|+\sqrt{x-1}-3=1\\ < =>2\sqrt{x-1}-5+2\left|x+5-5\sqrt{x-1}\right|=1\\ < =>2\left|x+5-5\sqrt{x-1}\right|=6-2\sqrt{x-1}\\ < =>\left|x+5-5\sqrt{x-1}\right|=3-\sqrt{x-1}\)

\(< =>\left[{}\begin{matrix}x+5-5\sqrt{x-1}=3-\sqrt{x-1}\left(1\right)\\x+5-5\sqrt{x-1}=\sqrt{x-1}-3\left(2\right)\end{matrix}\right.\)

Giải (1): \(x+5-5\sqrt{x-1}=3-\sqrt{x-1}\\ < =>x+2-4\sqrt{x-1}=0\\ < =>x-1-2\sqrt{x-1}.2+4=1\\ < =>\left(\sqrt{x-1}-2\right)^2=1\\ < =>\left[{}\begin{matrix}\sqrt{x-1}-2=1\\\sqrt{x-1}-2=-1\end{matrix}\right.< =>\left[{}\begin{matrix}x=8\\x=0\left(loại\right)\end{matrix}\right.\)

Giải (2) cũng ra x=8