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28 tháng 10 2021

3: \(f\left(-x\right)=\dfrac{\left(-x\right)^2+5}{\left(-x\right)^2-1}=\dfrac{x^2+5}{x^2-1}=f\left(x\right)\)

Vậy: f(x) là hàm số chẵn

Ũmg cíu e vs ạ e sắp phải nộp rùiii 1. He arrived in England … ……. Monday evening.A. at B. in C. on D. of 2. It started to rain… ……………….. we stopped playing tennis. A. if B. so C. because D. though 3. I'm … ……………….. my examination next Monday. A. taking B. took C.to take D. taken 4. She told me … ……………….. you that present. A. to give B. gave C. giving D. given 5. London is … ……………….. capital city in Europe. A....
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Ũmg cíu e vs ạ e sắp phải nộp rùiii 1. He arrived in England … ……. Monday evening.A. at B. in C. on D. of 2. It started to rain… ……………….. we stopped playing tennis. A. if B. so C. because D. though 3. I'm … ……………….. my examination next Monday. A. taking B. took C.to take D. taken 4. She told me … ……………….. you that present. A. to give B. gave C. giving D. given 5. London is … ……………….. capital city in Europe. A. the largest B. large C. larger D. largest 6. My pen pal and I are far away from each other, but we always … ………………... A. keep on B. get on C. keep in touch D. go on 7. My father … ……………….. football when he was young. A. uses to play B. used to playing C. use to play D. used to play 8. I wish you … ……………….. a longer vacation. A. don't have B. had C. have D. having 9. Do you have to learn these new words … ………………..? A. with heart B. by heart C.in mind D. with mind 10. He … ……………….. English for 4 years. A. learns B. learnt C. has learnt D. will learn 11. My friend, … ……………….. bicycle was stolen last week, has decided to buy a motorbike A. whom B. which C. who D. whose 12. You have cleaned your bike, … ………………..? A. have you B. do you C. haven’t you D. don’t you 13. Why don’t you have your house … ………………..? A. repainted B. repaint C. to repaint D. repainting 14 . She suggested ……….. money for the poor people in the region. A. to save B. saved C. saving D. save 15. He drives very … ……………….. and has got two accidents this year. A. safely B. carefully C. carelessly D. care 16. The film star..........lives in California is coming to his house next week. A. who B. whom C. which D. whose 17. He wasn’t very hungry, … ……………….. he still ate a lot of bread. A. so B. but C. and D. because 18. Tuan is reading a book .....................by Shakespeare. A. written B. is written C. wrote D. was written 19. The car was … ……………….. that she couldn’t afford it. A. such expensive B. so expensive C. too expensive D. expensive enough 20. The room … ……………….. when I arrived. A. was cleaned B. is cleaned C. was cleaning D. was being cleaned

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21 tháng 2 2020

đề là gì x \(\in\)z hay là gì

\(|x+9|.2=1\)

\(|x+9|=2\)

\(\Rightarrow\orbr{\begin{cases}x+9=2\\x+9=-2\end{cases}\Rightarrow\orbr{\begin{cases}x=-7\\x=-11\end{cases}}}\)

3 tháng 5 2023

Đề yêu cầu gì em?

AH
Akai Haruma
Giáo viên
3 tháng 5 2023

Lời giải:

Điều kiện: $x\neq 0; -1$

$\frac{x+3}{x+1}-2=\frac{1-x}{x}$
$1+\frac{2}{x+1}-2=\frac{1}{x}-1$

$\frac{2}{x+1}-1=\frac{1}{x}-1$

$\frac{2}{x+1}=\frac{1}{x}$

$\Rightarrow 2x=x+1$
$\Leftrightarrow x=1$ (thỏa mãn)

13 tháng 1 2022

comes

13 tháng 1 2022

comes

6 tháng 9 2021

c. \(\left|\dfrac{8}{4}-\left|x-\dfrac{1}{4}\right|\right|-\dfrac{1}{2}=\dfrac{3}{4}\)

\(\Rightarrow\left[{}\begin{matrix}\left|\dfrac{8}{4}-x+\dfrac{1}{4}\right|-\dfrac{1}{2}=\dfrac{3}{4}\\\left|\dfrac{8}{4}+x-\dfrac{1}{4}\right|-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}\left|\dfrac{9}{4}-x\right|-\dfrac{1}{2}=\dfrac{3}{4}\\\left|\dfrac{7}{4}+x\right|-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}\dfrac{9}{4}-x-\dfrac{1}{2}=\dfrac{3}{4}\\x=\dfrac{9}{4}-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\\\left[{}\begin{matrix}\dfrac{7}{4}+x-\dfrac{1}{2}=\dfrac{3}{4}\\-\dfrac{7}{4}-x-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}x=1\\x=\dfrac{7}{2}\end{matrix}\right.\\\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=-3\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{7}{2}\\x=-3\end{matrix}\right.\) 

Ở nơi x=9/4-1/2 là x-9/4-1/2 nha

 

 

6 tháng 9 2021

a. -1,5 + 2x = 2,5

<=> 2x = 2,5 + 1,5

<=> 2x = 4

<=> x = 2

b. \(\dfrac{3}{2}\left(x+5\right)-\dfrac{1}{2}=\dfrac{4}{3}\)

<=> \(\dfrac{3}{2}x+\dfrac{15}{2}-\dfrac{1}{2}=\dfrac{4}{3}\)

<=> \(\dfrac{9x}{6}+\dfrac{45}{6}-\dfrac{3}{6}=\dfrac{8}{6}\)

<=> 9x + 45 - 3 = 8

<=> 9x = 8 + 3 - 45

<=> 9x = -34

<=> x = \(\dfrac{-34}{9}\)

14 tháng 12 2016

- Bọ cạp,nhện,ve bò có thể xếp chúng vào lớp hình nhện vì : + Cơ thể có 2 phần đầu-ngực và bụng. + Có 4 đôi chân bò.