Question

Bài 2: Thu gọn các đơn thức

a) \(2x^2y^2.\dfrac{1}{4}xy^3.\left(-3xy\right)\)        b) \(\left(-2x^3y\right)^2.xy^2.\dfrac{1}{2}y^5\)

Answer 1

a: \(=-2\cdot\dfrac{1}{4}\cdot3\cdot x^2y^2\cdot xy\cdot xy^3=-\dfrac{3}{2}x^4y^6\)

b: \(=4x^6y^2\cdot xy^2\cdot\dfrac{1}{2}y^5=2x^7y^9\)

Answer 2

a) \(=\left(2.\dfrac{1}{4}.\left(-3\right)\right).\left(x^2.x.x\right).\left(y^2.y^3.y\right)\)

\(=-\dfrac{3}{2}x^4y^6\)

 

b) \(-4x^6y^2.x.y^2.\dfrac{1}{2}y^5\)

\(=\left(4.\dfrac{1}{2}\right).\left(x^6.x\right).\left(y^2.y^2.y^5\right)\)

\(=2x^7y^9\)