\(a)m^2-4n^2=(m+2n)(m-2n)\\b)9x^2+6xy+y^2=(3x+y)^2\\c)(a-3b)^2-16c^2=(a-3b+4c)(a+3b-4c)\\d)8a^3-125=(2a-5)(4a^2+10a+25)\\e)27x^3+54x^2y+36xy^2+8y^3=(3x+2y)^3\\f)16x^2-(x-y)^2=(4x+x-y)(4x-x+y)=(5x-y)(3x+y)\)

\(\left(x+\dfrac{1}{2}\right)\left(\dfrac{1}{2}-x\right)=\dfrac{1}{4}-x^2\)

e) vẫn rút tiếp dc nhé