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2 tháng 11 2023

1 academy

2 independently

3 educational

4 Generally

5 compulsory

6 activities

7 advanced

8 awarded

9 educative

10 academic 

11 behavior

12 attendance

13 considerably

14 computerise 

15 analysis

16 compulsorily

7 tháng 11 2023

sai nhiều câu quá, gợi ý ghi sẵn cả từ loại kế bên mà vẫn sai :((

1 tháng 8 2021

1 inconvenience

2 voluntarily

3 industrial

4 break-taking

5 intentively

6 breakdown 

7 preferable

8 economical

9 acceleration

10 misunderstanding

11 inhabitant

12 kidnapper

13 foggy

14 shouthern

15 decision

16 entertainment

17 information

18 pronounciation

1 tháng 8 2021

Em cảm ơn nhiều ạ 

10 tháng 1 2020

x - 16 =3

x       =  16 + 3

x          = 19

10 tháng 1 2020

Ta có x-16=5-2*x

          x+2*x=5+16

          x*(1+2)=21

          x*3=21

          x=21/3

           x=7

Dạ Anh/Chị trong group giải giúp em câu này với ạ. Em cám ơn nhiều.      I.          Use the correct form of the word given in each sentence:1.     Like beverage cans and bottles, this _______________ can be recycled. (produce)2.     The next stage in the _______________ of television is interactive TV. (develop)3.     You’d better put an _______________ in the local paper to sell your house. (advertise)4.     I enjoy the constant _______________ with students from other classes....
Đọc tiếp

Dạ Anh/Chị trong group giải giúp em câu này với ạ. Em cám ơn nhiều.

      I.          Use the correct form of the word given in each sentence:

1.     Like beverage cans and bottles, this _______________ can be recycled. (produce)

2.     The next stage in the _______________ of television is interactive TV. (develop)

3.     You’d better put an _______________ in the local paper to sell your house. (advertise)

4.     I enjoy the constant _______________ with students from other classes. (interact)

5.     The Internet is a very useful means of _______________. (communicate)

6.     There’s a lot of crime and _______________ on TV today. (violent)

7.     Her novel is known to everyone. It is _______________ read. (wide)

8.     Because Hoa lives in a remote area, the Internet isn’t _______________ for her. (availability)

9.     My brother would like to be a _______________. (journal)

10.  He was a town_______________ who had to stand in markets and public spaces, shouting the news to the residents of the town. (cry)

11.  I find this newspaper _______________. I can get much useful knowledge from it. (inform)

12.  Computers are becoming _______________ popular. They make everything faster and more reliable. (increase)

13.  Watching TV has become one of the most popular forms of _______________. (entertain)

14.  Nowadays, the Internet is _______________ used. We can see many products. (commerce)

15.  _______________ is a film or radio or television program giving facts about something.(document)

16.  The show brought _______________ to millions of viewers. (enjoy)

17.  Although this laptop was a bit _______________, I still bought it yesterday. (cost)

18.  There is a _______________ of local and international programs on TV. (vary)

19.  I’m looking forward to seeing your _______________. (respond)

20.  By learning English, we can understand more about the _______________ countries in the world. (develop)

21.  It’s _______________to try to talk to her because she never listens. (use)

22.  They walked _______________ to the room. (purpose)

23.  Alexander G. Bell was one of the greatest _______________. (invent)

24.  These mountain villages are completely _______________ in winter. (access)

25.  I found the talk both informative and _______________. (entertain)

26.  The Internet is becoming a _______________ tool for teachers. (use)

27.  For most people a good _______________ helps them get a better job. (educate)

28.  He was good at making up funny stories. He has an­­­­­­­­­­­­­_______________ mind. (invent)

    II.          Rearrange the groups of words in a correct order to make complete sentences:

1.     part of our everyday life / has increasingly / The internet / developed and become /. /

_______________________________________________________________

2.     of using the computer, / can they? / can deny the advantages / No one/

_______________________________________________________________

3.     uses the Internet / every day, / Your father / doesn’t he?

_______________________________________________________________

4.     are used / with TV / Remote controls / to interact/./

_______________________________________________________________

5.     news as / Town criers / they were walking / shouted the latest/./

__________________________________________________________________

6.     is a very fast / The Internet / for me to get information/ and convenient way/./

__________________________________________________________________

7.     most of the time / which website is useful / wandering because / I don’t know / I spend/. /

_______________________________________________________________

8.     TV viewers / can watch a variety / on different channels / of local and international programs /./

_______________________________________________________________

9.     My father / sports but / likes watching / my mother doesn’t/./

_______________________________________________________________

10.  Most people / and magazines / love reading / newspapers/./

_______________________________________________________________

0
12 tháng 8 2023

\(\dfrac{12}{16}=\dfrac{132}{176}\\ \dfrac{13}{16}=\dfrac{143}{176}\\ Ta.có:\dfrac{16}{22}< \dfrac{132}{176}< \dfrac{17}{22}< \dfrac{143}{176}< \dfrac{18}{22}\\ Vậy:Chọn.số.17\)

8 tháng 6 2021

Nãy ghi nhầm =="

a)Hđ gđ là nghiệm pt

`x^2=2x+2m+1`

`<=>x^2-2x-2m-1=0`

Thay `m=1` vào pt ta có:

`x^2-2x-2-1=0`

`<=>x^2-2x-3=0`

`a-b+c=0`

`=>x_1=-1,x_2=3`

`=>y_1=1,y_2=9`

`=>(-1,1),(3,9)`

Vậy tọa độ gđ (d) và (P) là `(-1,1)` và `(3,9)`

b)

Hđ gđ là nghiệm pt

`x^2=2x+2m+1`

`<=>x^2-2x-2m-1=0`

PT có 2 nghiệm pb

`<=>Delta'>0`

`<=>1+2m+1>0`

`<=>2m> -2`

`<=>m> 01`

Áp dụng hệ thức vi-ét:`x_1+x_2=2,x_1.x_2=-2m-1`

Theo `(P):y=x^2=>y_1=x_1^2,y_2=x_2^2`

`=>x_1^2+x_2^2=14`

`<=>(x_1+x_2)^2-2x_1.x_2=14`

`<=>4-2(-2m-1)=14`

`<=>4+2(2m+1)=14`

`<=>2(2m+1)=10`

`<=>2m+1=5`

`<=>2m=4`

`<=>m=2(tm)`

Vậy `m=2` thì ....

NV
1 tháng 11 2021

\(y'=\dfrac{\left(-2x+2\right)\left(x-3\right)-\left(-x^2+2x+c\right)}{\left(x-3\right)^2}=\dfrac{-x^2+6x-6-c}{\left(x-3\right)^2}\)

\(\Rightarrow\) Cực đại và cực tiểu của hàm là nghiệm của: \(-x^2+6x-6-c=0\) (1)

\(\Delta'=9-\left(6+c\right)>0\Rightarrow c< 3\)

Gọi \(x_1;x_2\) là 2 nghiệm của (1) \(\Rightarrow\left\{{}\begin{matrix}-x_1^2+6x_1-6=c\\-x_2^2+6x_2-6=c\end{matrix}\right.\)

\(\Rightarrow m-M=\dfrac{-x_1^2+2x_1+c}{x_1-3}-\dfrac{-x_2^2+2x_2+c}{x_2-3}=4\)

\(\Leftrightarrow\dfrac{-2x_1^2+8x_1-6}{x_1-3}-\dfrac{-2x_2^2+8x_2-6}{x_2-3}=4\)

\(\Leftrightarrow2\left(1-x_1\right)-2\left(1-x_2\right)=4\)

\(\Leftrightarrow x_2-x_1=2\)

Kết hợp với Viet: \(\left\{{}\begin{matrix}x_2-x_1=2\\x_1+x_2=6\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x_1=2\\x_2=4\end{matrix}\right.\)

\(\Rightarrow c=2\)

Có 1 giá trị nguyên

16 tháng 12 2021

BỚT TRẢ LỜI THIẾU SUY NGHĨ !!

16 tháng 12 2021

a) Cl2 + 2NaOH --> NaClO + NaCl + H2O

Chất oxh: Cl2, chất khử: Cl2

Sự oxhCl0 -1e--> Cl+1x1
Sự khửCl0 +1e--> Cl-1x1

 

b) \(n_{Cl_2}=\dfrac{17,92}{22,4}=0,8\left(mol\right);n_{NaOH}=0,5.4=2\left(mol\right)\)

PTHH: Cl2 + 2NaOH --> NaClO + NaCl + H2O

_____0,8---->1,6--------->0,8---->0,8

=> \(\left\{{}\begin{matrix}C_{M\left(NaCl\right)}=\dfrac{0,8}{0,5}=1,6M\\C_{M\left(NaClO\right)}=\dfrac{0,8}{0,5}=1,6M\\C_{M\left(NaOH\right)}=\dfrac{2-1,6}{0,5}=0,8M\end{matrix}\right.\)

 

6 tháng 1 2022

Cj thật ak

6 tháng 1 2022

Con trai mà