Question

Phan tich da thuc sau thanh nhan tu ( help me please :< )

1/ x² - 2xy + y² - 4

2/ a² - 30ab + 15b² - 60c²

3/ 18m² - 36mn + 18n² - 72p²

4/ 9a² - 18ab + 9b² - 36c²

5/ 5a ( x - 3y ) + 8b ( 3y - x )

6/ 7x² - 14xy + 7y² - 7z²

7/ 3x² - 3y² - 5x + 5y

8/ x² - xy + 5x - 5y

9/ 2x² - 5x -7

10/ 14x²y - 21xy² + 28x²y²

11/ x(x-y) - 5x + 5y

Answer 1

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

3: \(=18\left(m^2-2mn+n^2-4p^2\right)\)

\(=18\left(m-n-2p\right)\left(m-n+2p\right)\)

4: \(=9\left(a^2-2ab+b^2-4c^2\right)\)

\(=9\left(a-b-2c\right)\left(a-b+2c\right)\)

5: \(=\left(x-3y\right)\left(5a-8b\right)\)

6: \(=7\left(x^2-2xy+y^2-z^2\right)\)

\(=7\left(x-y-z\right)\left(x-y+z\right)\)