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1. I'll have to buy a map......I don't know this area. B. that C. where D. because of A. if 2. It is recommended that he..........this course. A. took B. takes C. take D. taking 3. He's running so fast. I.............catch up with him. A. cannot hardly C. not hardly B. can hardly D. could hardly 4. It is important that he...... take the final examination. A. has to B. have to C. had to D. having to 5. I wil be............... if she manages to sell that motorbike at a high price. A....
Đọc tiếp

1. I'll have to buy a map......I don't know this area.

B. that C. where D. because of A. if

2. It is recommended that he..........this course.

A. took B. takes C. take D. taking

3. He's running so fast. I.............catch up with him.

A. cannot hardly C. not hardly B. can hardly D. could hardly

4. It is important that he...... take the final examination.

A. has to B. have to C. had to D. having to

5. I wil be............... if she manages to sell that motorbike at a high price.

A. surprised B. surprise C. surprising D. to surprise

6. Unless you understand, I..........expain it again to you.

A. am B. was D. would C.will

7. If you know where she lives, please let me..................

A. know B. knew C. known D. know

9................... you are interested in this film, don't go to see it at any cost.

A. Unless B. If C. Because D. So

10. If you like that book, I will give it........you as my present.

A. to B. from C. at D. for

12. How about..........dinner with us on sunday?

A.to have B.have C. have had D. having

13. My brother is very fond of.......to pop and rock music.

A.listen B.to listen C. listening D. listens

14. Life today is very different............. life 50 years ago.

A.to B.from C. with D. athis laboratory

15. My uncle is a................. .He often does research

A.science B.scientist C. scientific D. scientists

16. My father arrives in Singapore ..................Monday evening.

B.at C. from D. on A.in

17. John goes to his office every day except Sunday. .............Sundays he stays at home

A.On B.At C. In D. From

18. I hope the weather will be nice........ the weekend.

B.to C. at D. between A.in

20. Helen is always in the kitchen. She enjoys........

C. cooks D. cooking B.to cook A.cook

2
31 tháng 8 2018

1. I'll have to buy a map......I don't know this area.

B. that C. where D. because of A. if

2. It is recommended that he..........this course.

A. took B. takes C. take D. taking

3. He's running so fast. I.............catch up with him.

A. cannot hardly C. not hardly B. can hardly D. could hardly

4. It is important that he...... take the final examination.

A. has to B. have to C. had to D. having to

5. I wil be............... if she manages to sell that motorbike at a high price.

A. surprised B. surprise C. surprising D. to surprise

6. Unless you understand, I..........expain it again to you.

A. am B. was D. would C.will

7. If you know where she lives, please let me..................

A. know B. knew C. known D. know

9................... you are interested in this film, don't go to see it at any cost.

A. Unless B. If C. Because D. So

10. If you like that book, I will give it........you as my present.

A. to B. from C. at D. for

12. How about..........dinner with us on sunday?

A.to have B.have C. have had D. having

13. My brother is very fond of.......to pop and rock music.

A.listen B.to listen C. listening D. listens

14. Life today is very different............. life 50 years ago.

A.to B.from C. with D. athis laboratory

15. My uncle is a................. .He often does research

A.science B.scientist C. scientific D. scientists

16. My father arrives in Singapore ..................Monday evening.

B.at C. from D. on A.in

17. John goes to his office every day except Sunday. .............Sundays he stays at home

A.On B.At C. In D. From

18. I hope the weather will be nice........ the weekend.

B.to C. at D. between A.in

20. Helen is always in the kitchen. She enjoys........

C. cooks D. cooking B.to cook A.cook

31 tháng 8 2018

1. I'll have to buy a map......I don't know this area.

B. that C. where D. because of A. if

2. It is recommended that he..........this course.

A. took B. takes C. take D. taking

3. He's running so fast. I.............catch up with him.

A. cannot hardly C. not hardly B. can hardly D. could hardly

4. It is important that he...... take the final examination.

A. has to B. have to C. had to D. having to

5. I wil be............... if she manages to sell that motorbike at a high price.

A. surprised B. surprise C. surprising D. to surprise

6. Unless you understand, I..........expain it again to you.

A. am B. was D. would C.will

7. If you know where she lives, please let me..................

A. know B. knew C. known D. know

9................... you are interested in this film, don't go to see it at any cost.

A. Unless B. If C. Because D. So

10. If you like that book, I will give it........you as my present.

A. to B. from C. at D. for

12. How about..........dinner with us on sunday?

A.to have B.have C. have had D. having

13. My brother is very fond of.......to pop and rock music.

A.listen B.to listen C. listening D. listens

14. Life today is very different............. life 50 years ago.

A.to B.from C. with D. athis laboratory

15. My uncle is a................. .He often does research

A.science B.scientist C. scientific D. scientists

16. My father arrives in Singapore ..................Monday evening.

B.at C. from D. on A.in

17. John goes to his office every day except Sunday. .............Sundays he stays at home

A.On B.At C. In D. From

18. I hope the weather will be nice........ the weekend.

B.to C. at D. between A.in

20. Helen is always in the kitchen. She enjoys........

C. cooks D. cooking B.to cook A.cook

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 ~