a)

\(A=x^3-1-x^3+1=0\)

b)

\(B=x^3-3x^2+3x-1-x^3+3x^2-3x-1=-2\)

1. The Browns are traveling to Ha noi by train.

2. Would you like to listen to music?

1 , Can you help me wash .......up........ These dirty glasses .

3 , We look .....up.......... the new works in the dictionary .

3 , You shouldn't eat and watch TV .....at...... the same time .

4 , These cards are in alphabetical other and ........by........ author .

5 , Schools in Vietnam are different ........from.......... thoes in USA .

6 , Mary and I are looking forward .....to........ seeing you .

7 , Farmers are very hard-working . They work from morning .........till....... night .......on......... their farms .

8 , Children are growing ..........up........... fast .

9 , Mr.Minh is not at home now . He is .........at...... work .

Ta có:

\(B=\dfrac{x^{\left(39+36+33+....+3\right)}}{x^{\left(40+38+36+....+2\right)}}\)

\(39+36+33+....+3=\dfrac{\left(39+3\right)\left(\dfrac{39-3}{3}+1\right)}{2}=273\)

\(40+38+36+....+2=\dfrac{\left(40+2\right)\left(\dfrac{40-2}{2}+1\right)}{2}=420\)

\(\Rightarrow B=\dfrac{x^{273}}{x^{420}}=\dfrac{1}{x^{147}}\)

tương tự => \(A=\dfrac{x^{4560}}{x^{496}}=x^{4064}\)

3x+xy=3

=>(3x)y=3

=>3x,y là cặp ước của 3

mà 3x chia hết cho 3

=>3x thuộc {3,-3}=>x thuộc {1,-1}

=>y thuộc {1,-1}

X/ Tìm và sửa lỗi sai trong các câu sau

1, A: Do you like place new? => new place

B: Yes, we do. It’s a quite big house. => quite a

A: How much rooms has it got? => many

B: Its got a living room, s kitchen, a bathroom and two bedrooms.=>has got

A: Has it got a garden?

B: Yes, it has got.=> bỏ

2, Her sister –in-law has a baby next month.=> will have

3, I have to write a letter. Can you lend me a paper and an envelope?

=> some/some

4, You haven’t to stay in bad when you feel better.

=> bed

5, Let’s don’t go home late in the evening.=> bỏ

6, Mark is 4 feet 4 inches high.=> tall

7, Why does he want see the pictures of your family?

=> to see

8, I will make my friend some coffee when he will arrive

=> arrives

Chứ chẳng nhẽ đợi lớn con nào sinh được là con cái à :v

Cá mương thuộc họ cá chép thì so sánh cá chép được không nhở ??? chứ có biết mấy con cá này đâu.

Thông tin bạn ??? ít nhất cũng cho đoạn văn chứ ?