Bài 1:
a) \(2x^2y\left(3xy-4xy^2-\frac{3}{2xy^3}\right)\) \(=6x^3y^2-8x^2y^3-\frac{3x}{y^2}\)
b) \(\left(15x^4y^2-36x^3y^4+21x^2y^5\right):3x^2y^2\)\(=5x^2-12xy^2+7y^3\)
Bài 2:
a) \(x^2-4xy+4y^2-16\) \(=\left(x-2y\right)^2-16=\left(x-2y-4\right)\left(x-2y+4\right)\)
b) \(2x+xy-x^2-xy\) \(=x\left(2-x\right)\)
c)\(16x^2-25y^2=\left(4x-5y\right)\left(4x+5y\right)\)