Con ốc sên nhé bạn 

(5-y²)(5+y²)

= 5² - (y²)²

= 25 - y⁴

Áp dụng HĐT: (A-B)(A+B) = A² - B²

(2/3x+3y).(3y-2/3x)

= ( 3y)^2  - ( 2/3 x )^2

=  9y^2  - 4/9 x^2

`(2/3 x+3y)(3y-2/3x)`

`=(3y +2/3x)(3y-2/3x)`

`= (3y)^2 - (2/3x)^2`

`= 9y^2 - 4/9 x^2`

Vận dụng : `A^2-B^2=(A-B)(A+B)`

(2x-1)(2x+1)(4x² +1)

= (4x² - 1)(4x²+1)

=16x⁴ - 1 

(2x-1).(2x+1).(4x^2+1)

= (4x^2 - 1).(4x^2+1)

=  (4x^2)^2  -  1

=  16x^4  - 1

(x+4)(x-4)

= x² - 4²

= x² - 16

Áp dụng HĐT: (A-B)(A+B)= A² - B²

(x+4).(x-4)

= x^2  -  4^2

=  x^2  -  16

\(9y^2-\left(x+y\right)^2=\left(3y-x-y\right)\left(3y+x+y\right)=\left(2y-x\right)\left(4y+x\right)=8y+2xy-4xy-x^2\)

\(=8y^2-2xy-x^2\)

`9y^2 - (x+y)^2`

`= (3y)^2 - (x+y)^2`

`= (3y - x - y) (3y +x+y)`

`= (2y - x) (4y+x)`

`= 2y (4y+x)-x(4y+x)`

`= 8y^2 + 2xy - 4xy - x^2`

`= 8y^2 - 2xy - x^2`

Vận dụng HĐT : `A^2 - B^2 = (A-B)(A+B)`

\(x^2+y^2+2x+2y+2\left(x+1\right)\left(y+1\right)+2\)

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

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

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

\(=\left(x+y+2\right)^2\)

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

= ( x-y).(x+y)

`(x+y+z)(x+y+z)`

`=(x+y+x)^2`

`=(x+y)^2(x+z)^2(z+y)^2`

Lời giải:
$(x+y+z)(x+y+z)=(x+y+z)^2=x^2+y^2+z^2+2(xy+yz+xz)$

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