a, Ta có : \(x^2-2xy+y^2\)\(=\left(x-y\right)^2\)
b, Ta có : \(x^2-y^2=\left(x-y\right)\left(x+y\right)\)
c, Ta có : \(4x^2-9y^2=\left(2x-3y\right)\left(2x+3y\right)\)
d, Ta có : \(\left(x-5\right)^2-16=\left(x-5+4\right)\left(x-5-4\right)=\left(x-1\right)\left(x-9\right)\)
a) Ta có: \(x^2-2xy+y^2\)
\(=\left(x-y\right)^2\)
b) Ta có: \(x^2-y^2\)
\(=\left(x-y\right)\left(x+y\right)\)
c) Ta có: \(4x^2-9y^2\)
\(=\left(2x-3y\right)\left(2x+3y\right)\)
d) \(\left(x-5\right)^2-16\)
\(=\left(x-5-4\right)\left(x-5+4\right)\)
\(=\left(x-9\right)\left(x-1\right)\)