cho biểu thức

M=\(\left(1-\dfrac{\sqrt{a}}{1+\sqrt{a}}\right):\left(\dfrac{\sqrt{a}+3}{\sqrt{a}-2}+\dfrac{\sqrt{a}+2}{3-\sqrt{a}}+\dfrac{\sqrt{a}+2}{a-5\sqrt{a}+6}\right)\)

a) Rút gọn M

b) Tìm a để M < 0

c) Tìm a để M > 1

d) Tìm Min M

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

1. I want to.................. this caake into 4 parts (division)

2. Her new album is very ...................( impress)

3. I enjoy a............ life in Viet Nam (peace)

4. Please drive ............., or you will have an accident .(care)

5. The sweater is designed without sleeves. It os..................(sleeve)

Cho M=\(\dfrac{\sqrt{a}+2}{\sqrt{a}-2}\)

Tìm a ∈ Z để M ∈ Z

b) Tìm a ∈ Q để M ∈ Z

write a word to complete each activity. if a word is not needed , write an X

play, keep, have, am, send, get, use, do, go , take

1. ................................... wedding

2.....................texts

3..............................busy

4........................sing

5.................. a diary

help mee :((

Tìm đa thức M biết:

a) 2 x 6   - x 4 - 2 x 2 +1 = M.(2 x 2  -1);

b) ( x 2 +x + 1).M = x 4   -   x 3  - 4 x 2  - 5x - 3.

Làm tính chia:

a) [ 2 ( x   +   y ) 3   -   3 ( x   +   y ) 2 ]: 3(x + y);

b) [ 15 ( x   -   y ) 3   +   12 ( y   –   x ) 2  - x + y]: (3y - 3x);

c) ( 8 x 3   -   27 y 3 ) : (2x - 3y).

Mark the letter A,B,C or D on your answer sheet to indicate the word whose underlined part differs from the other three in the pronunciation in each of the following questions.

A. assure

B. press

C. blessing

D. classic

Có bao nhiêu đồng phân có công thức phân tử là C₅H₁₀O tham gia phản ứng tráng gương?

A. 3

B. 4

C. 5

D. 6