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11 tháng 10 2020

1.I didn't go to school because I was sick

I was sick,so I didn't go to school.

2.He likes playing computer games in his free time

His hobby is playing computer games.

3.I am interested in watching TV in the evening

I enjoy watching TV in the evening.

4.I think that learning English is important

I find learing English important

5.The tickets to the show are too expensive for us

The tickets to the show cost expensively to us.

6.We can get to the art gallery in half an hour

It only half an hour for us to get to the art gallery.

7.Her book is not the same as mine

Her book is different from mine.

7 tháng 8 2021

1I didn't arrive in time to see her
I wasn't early enough to see her
2. . We couldn't drive because of the fog
The fog prevented us from driving
3. A train leaves at eight o'clock every morning
There is an eight-o'clock train every morning
4. . John asked if it was the blue one or the green she wanted
Which. do you want, the blue one or the green? John asked her
5. I haven't eaten this kind of food before
This is the first time I have earen this kind of food
6. She started working as a secratary five years ago
She has .worked as a secratary for five years 
7. " Why don't you put your luggage under the seat?"he asked
He suggested that I put my luggage under the seat
8. I'm sure you didn't lock the front door. Here is the key
You can't have locked the front door
9. He couldn't repair the broken vase.
The vase couldn't be repaired by him
10. I started work for the company a year ago
I've been working for the company for a year

19 tháng 11 2015

rút gọn thừa số chung:
2.1x=1+(-1)1+1x^2

đơn giàn biểu thức:
-1+(-1)((-1)1)+2.1x+(-1)(1x^2)=0

giải phương trình:
-(1x^2-2.1x-1+10=0

giài phương trình

1x^2-2.1x-1+1=0

BẠN NHỚ VẼ ĐỒ THỊ HÀM SỐ ĐỂ TIỆN LÀM BÀI NHÉ...MÌNH KHÔNG BIẾT VẼ NHƯ THẾ NÀO TRÊN ONLINE MATH NÊN BẠN VẼ ĐƯỢC MÀ...LỚP 9 RỒI...mình học lớp 7..tich cho mình nha

1 tháng 8 2019

A, bạn ơi mình biết làm hết r

B,cài này dễ lằm bạn nghĩ đi okeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

7 tháng 2 2018

a) \(\left|\left|x-1\right|-1\right|=2\Rightarrow\orbr{\begin{cases}\left|x-1\right|-1=2\\\left|x-1\right|-1=-2\end{cases}}\Rightarrow\orbr{\begin{cases}\left|x-1\right|=3\\\left|x-1\right|=-1\left(l\right)\end{cases}}\)

TH1: x - 1 = 3

         x      = 4

TH2: x - 1 = - 3

        x       = - 2 

b) Tương tự câu a.

c) \(\left|\left|2x-3\right|-x+1\right|=42-8\)

\(\left|\left|2x-3\right|-x+1\right|=34\)

TH1: \(\left|2x-3\right|-x+1=34\)

\(\left|2x-3\right|-x=33\)

Với \(x\ge\frac{3}{2}\), ta có \(2x-3-x=33\Rightarrow x=36\)  (tm)

Với \(x< \frac{3}{2}\), ta có \(3-2x-x+1=34\Rightarrow-3x=30\Rightarrow x=-10\left(tm\right)\)

TH2: \(\left|2x-3\right|-x+1=-34\)

\(\left|2x-3\right|-x=-35\)

Với \(x\ge\frac{3}{2}\), ta có \(2x-3-x=-35\Rightarrow x=-32\)  (l)

Với \(x< \frac{3}{2}\), ta có \(3-2x-x+1=-34\Rightarrow-3x=38\Rightarrow x=\frac{38}{3}\left(l\right)\)

d) Tương tự câu c.

=>|2x+1|=|x-1|

=>2x+1=x-1 hoặc 2x+1=1-x

=>x=-2 hoặc x=0

18 tháng 5 2022

`|2x+1|-|x-1|=0`

`<=>|2x+1|=|x-1|`

`<=>4x^2+4x+1=x^2-2x+1`

`<=>3x^2+6x=0`

`<=>3x(x+2)=0`

`<=>` $\left[\begin{matrix} x=0\\ x=-2\end{matrix}\right.$

a: \(\Leftrightarrow\left\{{}\begin{matrix}3x-2>-4\\3x-2< 4\end{matrix}\right.\Leftrightarrow-\dfrac{2}{3}< x< 2\)

c: \(\Leftrightarrow\left[{}\begin{matrix}3x-1>5\\3x-1< -5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x>2\\x< -\dfrac{4}{3}\end{matrix}\right.\)

d: \(\Leftrightarrow\left[{}\begin{matrix}3x+1>x-2\\3x+1< -x+2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x>-3\\4x< 1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x>-\dfrac{3}{2}\\x< \dfrac{1}{4}\end{matrix}\right.\)

11 tháng 12 2016

suy ra /2x + 1/ + /2x - 1/ lớn hơn hoặc bằng

/2x + 1 + 1 - 2x/ = /2/ = 2

Dấu bằng xãy ra khi:(2x + 1).(2x-1)

suy ra -1/2 bé hơn hoặc bằng x lớn hơn hoặc bằng 1/2

kick cho mk nhé

20 tháng 4 2018

Chọn C.

14 tháng 7 2019

#)Giải :

a) \(\left|x-1\right|+\left|x+2\right|=0\Leftrightarrow\orbr{\begin{cases}x-1=0\\x+2=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=1\\x=-2\end{cases}}}\)

b) \(\left|2x-1\right|+\left|y^2-y\right|=0\Leftrightarrow\orbr{\begin{cases}2x-1=0\\y^2-y=0\end{cases}\Leftrightarrow\orbr{\begin{cases}2x=1\\y^2=y\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=\frac{1}{2}\\y\in\left\{-1;0;1\right\}\end{cases}}}\)