K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

1. I've given your old jacket away............. it was too tight for you. A. because of B.if C. because D.and 2. Our holiday was too short. The time................... A. passed quick B. quick passed D. quickly passes C. passed quickly 3. You can't stop me..........what I want. A. doing C. do B. to do D. that I do 4. Help me,........... ? A. will you C. do you B. won't you D. don't you 5. I like Cathy. She.......... A. works very fastly B. works very fast D. working very fast C....
Đọc tiếp

1. I've given your old jacket away............. it was too tight for you.

A. because of B.if C. because D.and

2. Our holiday was too short. The time...................

A. passed quick B. quick passed D. quickly passes C. passed quickly

3. You can't stop me..........what I want.

A. doing C. do B. to do D. that I do

4. Help me,........... ?

A. will you C. do you B. won't you D. don't you

5. I like Cathy. She..........

A. works very fastly B. works very fast D. working very fast C. work very fastly

6. I'm absolutely sure I locked the door. I clearly remember.........it

A. to lock B. locking C. lock D. locked

8. When I arrived, he was trying.............. it, but there was something wrong with the engine

A. to start B. stated C. starting D. start

12. It is very important that everybody..........very carefully

A. should listen B. to listen C. listens D. will listen

14. peopke find the water dirty......there are some waste chemicals in it.

B. as C. but D. where A. and

15........... you smoke too much, you'll get respiratory problems

A. If C. As D. Because B. Though

17.............. it is rainy, I walk home with my umbrella.

B. Though B. when C. but A. When

18. The building was completely collapsed............ the righter came.

C. But D. Because A and D. so

19 ..................it got dark, the students couldn't find the way out of the forest.

A. As B. And C. When D. Who

20. The children stopped fighting...........their parents back home.

A. and B. when C, but D. so

II. WRITING: Put adjective or adverb to complete the sentence:

1. I heard Daniel isn't very....... (good)

- Well, he fell and hurt himself quite................. (bad)

2. there was a .................(terrible) accident on this road two days ago,wasn't there?

-Yes, two people were killed and the driver of the car was ..........(serious) injured.

3. The weather was so ..........(awful) yesterday

- Yes, it was raining quite......(heavy) so we stayed at home all day

4. You haven't cleaned the floor.............. (proper). It is still..............(dirty)

-Oh, sorry

5. You didn't look very.......... (happy) last night.

- Well, I was disappointed that I did so..............(bad) in the exam.

6. Can you remember what happen?

- I can't remember........... (clear). It all happened so ............(sudden)

7. Don't go up that ladder. It doesn't look.............. (safe)

- Don't worry. I'll climb............(careful)

8. Did you go to Sally's birthday party?

-Yes, It was really ............. (cheerful) party. Everybody party was .............(colorful) dressed

4
31 tháng 8 2018

1. I've given your old jacket away............. it was too tight for you.

A. because of B.if C. because D.and

2. Our holiday was too short. The time...................

A. passed quick B. quick passed D. quickly passes C. passed quickly

3. You can't stop me..........what I want.

A. doing C. do B. to do D. that I do

4. Help me,........... ?

A. will you C. do you B. won't you D. don't you

5. I like Cathy. She..........

A. works very fastly B. works very fast D. working very fast C. work very fastly

6. I'm absolutely sure I locked the door. I clearly remember.........it

A. to lock B. locking C. lock D. locked

8. When I arrived, he was trying.............. it, but there was something wrong with the engine

A. to start B. stated C. starting D. start

12. It is very important that everybody..........very carefully

A. should listen B. to listen C. listens D. will listen

14. peopke find the water dirty......there are some waste chemicals in it.

B. as C. but D. where A. and

15........... you smoke too much, you'll get respiratory problems

A. If C. As D. Because B. Though

17.............. it is rainy, I walk home with my umbrella.

B. Though B. when C. but A. When

31 tháng 8 2018

1. I've given your old jacket away............. it was too tight for you.

A. because of B.if C. because D.and

2. Our holiday was too short. The time...................

A. passed quick B. quick passed D. quickly passes C. passed quickly

3. You can't stop me..........what I want.

A. doing C. do B. to do D. that I do

4. Help me,........... ?

A. will you C. do you B. won't you D. don't you

5. I like Cathy. She..........

A. works very fastly B. works very fast D. working very fast C. work very fastly

6. I'm absolutely sure I locked the door. I clearly remember.........it

A. to lock B. locking C. lock D. locked

8. When I arrived, he was trying.............. it, but there was something wrong with the engine

A. to start B. stated C. starting D. start

12. It is very important that everybody..........very carefully

A. should listen B. to listen C. listens D. will listen

14. peopke find the water dirty......there are some waste chemicals in it.

B. as C. but D. where A. and

15........... you smoke too much, you'll get respiratory problems

A. If C. As D. Because B. Though

17.............. it is rainy, I walk home with my umbrella.

B. Though B. when C. but A. When

18. The building was completely collapsed............ the righter came.

C. But D. Because A and D. so

19 ..................it got dark, the students couldn't find the way out of the forest.

A. As B. And C. When D. Who

20. The children stopped fighting...........their parents back home.

A. and B. when C, but D. so

13 tháng 12 2017

\(\dfrac{1}{1-x}\)+\(\dfrac{1}{1+x}\)+\(\dfrac{2}{1+x^2}\)+\(\dfrac{4}{1+x^4}\)+\(\dfrac{8}{1+x^8}\)+\(\dfrac{16}{1+x^{16}}\)

=

=\(\dfrac{4}{1-x^4}\)+\(\dfrac{4}{1+x^4}\)+\(\dfrac{8}{1+x^8}\)+\(\dfrac{16}{1+x^{16}}\)

=\(\dfrac{8}{1-x^8}\)+\(\dfrac{8}{1+x^8}\)+\(\dfrac{16}{1+x^{16}}\)

=\(\dfrac{16}{1-x^{16}}\)+\(\dfrac{16}{1+x^{16}}\)

=\(\dfrac{32}{1-x^{32}}\)

8 tháng 8 2015

a) Ta có I 2x - 1 I = 2015

=> 2x-1=2015 hoặc 2x-1=2015

+,Th1: 2x-1=2015

             2x=2015+1

             2x=2016

              x=2016:2

             x=1008

+,Th2: 2x-1=-2015

              2x=-2015+1

             2x=-2014

              x=-2014:2

             x=-1007

Vậy x=1008, x=-1007

 

 

|x-1|<5

th1: x-1<5=> x<6

th2: x-1<-5=> x<-4

vậy x <6 hoặc<-4

|x-1|>5 cũng tương tự như thế

còn mấy câu khác Nguyễn Diệu Thảo làm thế chắc bạn cũng biết cách làm rồi

L_I_K_E CHO MÌNH NHA!!!

a) Chương trình bị lỗi

b) Chương trình bị lỗi

c) Chương trình bị lỗi luôn

26 tháng 7 2019

I I  là dấu giá trị tuyệt đối nhé

26 tháng 7 2019

|7 + 5x| = 1 - 4x

=> \(\orbr{\begin{cases}7+5x=1-4x\left(đk:x\le\frac{1}{4}\right)\\7+5x=4x-1\left(đk:x\ge\frac{1}{4}\right)\end{cases}}\)

=> \(\orbr{\begin{cases}7-1=-4x-5x\\7+1=4x-5x\end{cases}}\)

=> \(\orbr{\begin{cases}6=-9x\\8=-x\end{cases}}\)

=> \(\orbr{\begin{cases}x=-\frac{2}{3}\left(tm\right)\\x=-8\left(ktm\right)\end{cases}}\)

|4x- 2x| + 1 = 2x

=> |4x2 - 2x| = 2x - 1

=> \(\orbr{\begin{cases}4x^2-2x=2x-1\left(đk:x\ge\frac{1}{2}\right)\\4x^2-2x=1-2x\left(đk:x\le\frac{1}{2}\right)\end{cases}}\)

=> \(\orbr{\begin{cases}4x^2-2x-2x+1=0\\4x^2-2x-1+2x=0\end{cases}}\)

=> \(\orbr{\begin{cases}\left(2x-1\right)^2=0\\4x^2-1=0\end{cases}}\)

=> \(\orbr{\begin{cases}2x-1=0\\x^2=\frac{1}{4}\end{cases}}\)

=> \(\orbr{\begin{cases}x=\frac{1}{2}\\x=\pm\frac{1}{2}\end{cases}}\)(tm)

Vậy ...

31 tháng 8 2023

???

6 tháng 4 2019

#It's the moment when you're in good mood, you accidentally click back =.=

1) Calculate

\(P=1\frac{1}{3}.1\frac{1}{8}.1\frac{1}{15}....1\frac{1}{63}.1\frac{1}{80}\)

\(=\frac{4}{3}.\frac{9}{8}.\frac{16}{15}....\frac{64}{63}.\frac{81}{80}\)

\(=\frac{2.2}{1.3}.\frac{3.3}{2.4}.\frac{4.4}{3.5}....\frac{8.8}{7.9}.\frac{9.9}{8.10}\)

\(=\frac{2.9}{10}=\frac{9}{5}\)

7 tháng 8 2019

ta có: 10010 + 1 > 10010 - 1

⇒ A = \(\frac{100^{10}+1}{100^{10}-1}< \frac{100^{10}+1-2}{100^{10}-1-2}=\frac{100^{10}-1}{100^{10}-3}=B\)

vậy A < B

19 tháng 12 2015

a) |2x +1| = 7

Th1: 2x + 1 = 7 

<=> x  = 3

Th2: 2x + 1 = -7 

<=> x = -4 

15 tháng 6 2018

\(1)\) Ta có : 

\(\left|2x-1\right|\ge0\)

\(\Leftrightarrow\)\(A=\left|2x-1\right|+8\ge8\)

Dấu "=" xảy ra \(\Leftrightarrow\)\(\left|2x-1\right|=0\)

\(\Leftrightarrow\)\(2x-1=0\)

\(\Leftrightarrow\)\(2x=1\)

\(\Leftrightarrow\)\(x=\frac{1}{2}\)

Vậy GTNN của \(A\) là \(8\) khi \(x=\frac{1}{2}\)

Chúc bạn học tốt ~ 

15 tháng 6 2018

\(2)\) Ta có : 

\(B=\left|x-3\right|+\left|x-9\right|-1\)

\(B=\left|x-3\right|+\left|9-x\right|-1\ge\left|x-3+9-x\right|-1=\left|6\right|-1=6-1=5\)

Dấu "=" xảy ra khi và chỉ khi \(\left(x-3\right)\left(9-x\right)\ge0\)

Trường hợp 1 : 

\(\hept{\begin{cases}x-3\ge0\\9-x\ge0\end{cases}\Leftrightarrow\hept{\begin{cases}x\ge3\\x\le9\end{cases}\Leftrightarrow}3\le x\le9}\)

Trường hợp 2 : 

\(\hept{\begin{cases}x-3\le0\\9-x\le0\end{cases}\Leftrightarrow\hept{\begin{cases}x\le3\\x\ge9\end{cases}}}\) ( loại ) 

Vậy GTNN của \(B\) là \(5\) khi \(3\le x\le9\)

Chúc bạn học tốt ~