Câu 3 hay câu4 bạn

Bài ca dao có sử dụng biện pháp so sánh Mồ hôi và mưa ruộng cày giúp em cảm nhận được sự vất vả, siêng năng của người nông dân. Câu cuối lại giúp em nhận ra người nông dân đã dãi nắng dầm mưa mới tạo ra được một hạt gạo dẻo, thơm thật chăm chỉ. Qua đó em càng thêm yêu quý người nông dân và thêm quý hạt gạo - thứ đã nuôi chúng ta lớn khôn từ thời thơ ấu.

- Lê Hữu Trác

Lê Hữu Trác

Lê Hữu Trác

1 She said that she was coming 

2 She said that she wouldn't see me the following day 

3 She said that he worked in a bank 

4 She said that he was living in Paris for a few months

5 Lan said that she would be very busy the next day 

6 Thu said that all the students would have a meeting the following sunday 

7 Tam said that she could swim acroos that river 

8 His sister said that she didn't buy that book 

9 The boy said that they had to try their best to win the match 

10 Her father said to her that she could go to the movies with her friends 

11 Her classmate said that Lan was the most intellligent girl in their class 

12 The teacher said that the sun rised in the east

ĐKXĐ: \(x\ne1;x\ne-1\)

\(\dfrac{x+1}{2x-2}+\dfrac{-2x}{x^2-1}\) \(=\dfrac{x+1}{2\left(x-1\right)}-\dfrac{2x}{\left(x-1\right)\left(x+1\right)}\) \(=\dfrac{\left(x+1\right)^2}{2\left(x-1\right)\left(x+1\right)}-\dfrac{4x}{2\left(x-1\right)\left(x+1\right)}\) \(=\dfrac{x^2+2x+1-4x}{2\left(x-1\right)\left(x+1\right)}\) \(=\dfrac{x^2-2x+1}{2\left(x-1\right)\left(x+1\right)}\) \(=\dfrac{\left(x-1\right)^2}{2\left(x-1\right)\left(x+1\right)}\) \(=\dfrac{x-1}{2\left(x+1\right)}\)

help me

 D nhoaaaaa bạn!!!

D

Tất cả k dưới đây đều là \(k\in Z\)

6.

\(\Leftrightarrow\sqrt{3}cot\left(3x-\dfrac{\pi}{3}\right)=1\)

\(\Leftrightarrow cot\left(3x-\dfrac{\pi}{3}\right)=\dfrac{1}{\sqrt{3}}\)

\(\Leftrightarrow cot\left(3x-\dfrac{\pi}{3}\right)=cot\left(\dfrac{\pi}{3}\right)\)

\(\Leftrightarrow3x-\dfrac{\pi}{3}=\dfrac{\pi}{3}+k\pi\)

\(\Leftrightarrow3x=\dfrac{2\pi}{3}+k\pi\)

\(\Leftrightarrow x=\dfrac{2\pi}{9}+\dfrac{k\pi}{3}\) 

7.

\(\Leftrightarrow\sqrt{3}tan\left(3x-15^0\right)=-1\)

\(\Leftrightarrow tan\left(3x-15^0\right)=-\dfrac{1}{\sqrt{3}}\)

\(\Leftrightarrow tan\left(3x-15^0\right)=tan\left(-30^0\right)\)

\(\Leftrightarrow3x-15^0=-30^0+k180^0\)

\(\Leftrightarrow3x=-15^0+k180^0\)

\(\Leftrightarrow x=-3^0+k60^0\)

8.

\(\Leftrightarrow\sqrt{3}cot\left(3x-30^0\right)=1\)

\(\Leftrightarrow cot\left(3x-30^0\right)=\dfrac{1}{\sqrt{3}}\)

\(\Leftrightarrow cot\left(3x-30^0\right)=cot\left(60^0\right)\)

\(\Leftrightarrow3x-30^0=60^0+k180^0\)

\(\Leftrightarrow3x=90^0+k180^0\)

\(\Leftrightarrow x=30^0+k60^0\)

to stop

to

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