Question

(4^3-5xy+2x) (-1/2xy)

Answer 1

Sửa đề: (4x^3-5xy+2x)*(-1/2xy)

=-4x^3*1/2xy+5xy*1/2xy-2x*1/2xy

=-2x^4y+5/2x^2y^2-x^2y

Answer 2

\(\left(4^3-5xy+2x\right)\left(-\dfrac{1}{2}xy\right)\)

\(=\left(64-5xy+2x\right)\left(-\dfrac{1}{2}xy\right)\)

\(=\left(-\dfrac{1}{2}xy\cdot64\right)-\left(5xy\cdot-\dfrac{1}{2}xy\right)+\left(2x\cdot-\dfrac{1}{2}xy\right)\)

\(=-32xy+\dfrac{5}{2}x^2y^2-x^2y\)