$\dfrac{2x+1}{x-1}<0$
$\to 2x+1$ và $x-1$ trái dấu.
\(\left[ \begin{array}{l}\begin{cases}2x+1<0\\x-1>0\\\end{cases}\\\begin{cases}2x+1>0\\x-1<0\\\end{cases}\end{array} \Leftrightarrow\right.\) \(\left[ \begin{array}{l}\begin{cases}x<-\dfrac{1}{2}\\x>1\\\end{cases}\\\begin{cases}x>-\dfrac{1}{2}\\x<1\\\end{cases}\end{array}\Leftrightarrow \right.\) \(\left[ \begin{array}{l}1<x<-\dfrac{1}{2}(\text{loại})\\-\dfrac{1}{2}<x<1(\text{nhận})\end{array} \right.\)
Vậy $S=\{x|-\dfrac{1}{2}<x<1\}$
` (2x+1)/(x-1) < 0`
Ta có ` 2x > x \to 2x +1 > x +1 > x -1`
`\to 2x +1 > x -1 `
` (2x+1)/(x-1) < 0` nên ` 2x +1` trái dấu với ` x -1`
`\to` $\begin{cases} 2x +1 > 0 \\\\ x -1 < 0 \end{cases}$
`\to` $\begin{cases} 2x > -1 \\\\ x <1 \end{cases}$
`\to` $\begin{cases} x >\dfrac{-1}{2} \\\\ x <1 \end{cases}$
Vậy ` -1/2 < x < 1`
Make questions for the answers. a. My name is Trung. b. I'm thirteen. c. I live with my parents. d. I walk to work. e. I am keen on english. f. It's about 200 meters from my house to the drug store. g. My birthday is on January 5th. h. My middle name is Thanh. i. No, i don't like playing chess. MN làm giúp mình vs . Mình cám ơn
Tính thể tích hình chóp tam giác đều A.BCD có cạnh là √2 và cạnh bên là 1
Mọi người làm giúp em với ạ.Em cảm ơn mọi người.Em vote 5 sao ạ
1. Mai/ usually/ listen/ K -pop music/ free time. 2. when/ I/ be/ a child/ I/ enjoy/ play/ computer games. 3. my father/ spend/ most/ spare time/ look after/ the garden 4. watching TV/ most/ popular/ leisure activity/ Britain? 5. many teenagers/ addicted/ the Internet/ computer games. 6. she/ get/ hooked/ the medical drama/ after/ watch/ the first episode 7. most/ my friends/ prefer/ play sports/ to/ surf the net. 8. today's word/ teenagers/ rely/ technology/ more/ the past.
Giải giúp mình bài này với, mình cảm ơn trước 🙂
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