x. [3/2.5 +3/5.8+ 3/8.11+3/11.14] = 1/21

=> x . [1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14] = 1/21

=> x. [1/2-1/14] = 1/21 => x . 3/7= 1/21 

=> x = 1/9

1. We (play) ......will play.......soccer this afternoon. Would you like (join) ...to join.........us?

2. You can borrow my umbrella. I (not/ use) ……am not using……….it at the moment.

3. I (not have) ....ado not have.........a car at the moment, so I (go) …go......to work on the bus this week. I usually drive to work.

4. Look!The plane (fly) …is flying…......towards the airport. It (land) ...........is going to land.............

5.Are you (hear)............hear.........anything? I (listen)........am listening...........hard but I can’t hear anything.

6. Nam (not visit) ……will not visit….. the museum next Monday because he (have)…will have…English test.

1. Lan’s hair is long.
Lan ............has long hair.....................................................................................
2. Nam rides his bike to school everyday.
Nam ....................goes to school by bike everyday..................................................
3. Nobody in our class is more intelligent than Nga.
Nga ............is the most intelligent student in uor class.................................
4. Let’s go swimming.
Shall ........we go swimming.......................................................... ?
5. When is your brithday?
What .............is your date of birth..................................................................................?

1. Let us use this computer.

Why ........don't we use this computer .....................................................? 

2. Lili likes the country life more than the city life.

Lili prefers ......the country life tothe city life...........................................................

3. Do you intend to fly to Ho Chi Minh city next Monday?

Are you going to .........fly to Ho Chi Minh city next Monday .......................................?

4. Would you mind not making noise in class?

I’d rather you didn’t  ...........make noise in the class...................................................?

5. How about drawing the picture?

Would you like ......to draw the picture...................................?

anh có 7 cái

TT^TT

Đúng

Tại vì nguyên tủ khối của Đơtểi = 1+1 =2

           nguyên tử khối của Hidro là 1

1. A. in                     B. at                            C. on

2. A. with                  B. of                             C . along

3. A. on                    B with                           C. X

4 . A. which              B. what                         C. when

5. A . letters              B . words                     C. lines

6. A . groups             B. pairs                        C. meanings

7. A. bying                 B. buy                            C. classroom

8. A. any                    B. some                         C. a

9. A . of                      B. for                              C. in

10 . A. tell                   B. talk                             C. share

Gọi 2 số cần tìm là \(\overline{ab};\overline{ba}\)

Theo đề ra ta có

\(\overline{ab}+\overline{ba}=176\)

\(\Rightarrow11a+11b=176\)

\(\Rightarrow a+b=16\)

Mà a khác b

\(\left(\overline{ab};\overline{ba}\right)=\left(97;79\right)\)

Vậy \(\left(\overline{ab};\overline{ba}\right)=\left(97;79\right)\)

\(x^2-3x+4\)

\(=x^2-2.x.\frac{3}{2}+\left(\frac{2}{3}\right)^2+\frac{7}{4}\)

\(=\left(x-\frac{3}{2}\right)^2+\frac{7}{4}\)

Vì \(\left(x-\frac{3}{2}\right)^2\ge0;\frac{7}{4}>0\)

=> Đa thưc vô nghiệm