giống vì đó là các từ phiên âm Hán-Việt

k) \(2x^3+2x^2y-4xy^2=2x\left(x^2+xy-2y^2\right)\)

l) \(x^3-7x^2+9x+3x^2-21x+27=x\left(x^2-7x+9\right)+3\left(x^2-7x+9\right)=\left(x+3\right)\left(x^2-7x+9\right)\)

a) \(3xy-6xy^2=3xy\left(1-2y\right)\)

b) \(3x^3+6x^2+3x=3x\left(x^2+2x+1\right)=3x\left(x+1\right)^2\)

c) \(x^3-x^2+2\)

d) \(x^2+4x+4-y^2=\left(x^2+4x+4\right)-y^2=\left(x+2\right)^2-y^2=\left(x-y+2\right)\left(x+y+2\right)\)

e) \(x^3+4x^2+4x=x\left(x^2+4x+4\right)=x\left(x+2\right)^2\)

f) \(x^2+2x+1-9y^2=\left(x+1\right)^2-\left(3y\right)^2=\left(x-3y+1\right)\left(x+3y+1\right)\)

g) \(6x^2-12x=6x\left(x-2\right)\)

h) \(x^3-2x^2+x=x\left(x^2-2x+1\right)=x\left(x-1\right)^2\)

i) \(x^2-2xy+y^2-9=\left(x-y\right)^2-3^2=\left(x-y-3\right)\left(x-y+3\right)\)

bạn chụp hết đề chưa vậy?

Exercise 5. Complete the second sentence so that it has similar meaning to the first sentence.

1. What is the price of a dish of five-colored sticky rice?
How much ……………………………………………………………………………….
2. Would do you mind carrying my basket for me, please?
Could …………………………………………………………………………………….
3. Why do some ethnic peoples build the communal house?
What ……………………………………………………………………………………. 
4. How long have you been an ethnologist?
When ……………………………………………………………….
5. Who do these beautiful ornaments belong to?
Whose ………………………………………………………………….

\(60-3\left(x-2\right)=51\)

=> \(3\left(x-2\right)=60-51=9\)

=> \(x-2=\dfrac{9}{3}=3\)

=> \(x=5\)

chúc em học tốt!

em ơi, sao chị không thấy có y mà