Question

rút gọn 

1, 1/7 x^2 y^3 ( -14/3 xy^2 ) -1/2 xy ( x^2 y^4 )

2, ( 3xy )^2 ( -1/2 x^3 y^2 )

3) ( -1/4 x^2 y )^2 ( 2/3 xy^4)^3

Answer 1

1) Ta có: \(\dfrac{1}{7}x^2y^3\cdot\left(-\dfrac{14}{3}xy^2\right)\cdot\left(-\dfrac{1}{2}xy\right)\left(x^2y^4\right)\)

\(=\left(-\dfrac{1}{7}\cdot\dfrac{14}{3}\cdot\dfrac{-1}{2}\right)\left(x^2y^3\cdot xy^2\cdot xy\cdot x^2y^4\right)\)

\(=\dfrac{1}{3}x^6y^{10}\)

2) Ta có: \(\left(3xy\right)^2\cdot\left(-\dfrac{1}{2}x^3y^2\right)\)

\(=9xy^2\cdot\dfrac{-1}{2}x^3y^2\)

\(=-\dfrac{9}{2}x^4y^4\)

3) Ta có: \(\left(-\dfrac{1}{4}x^2y\right)^2\cdot\left(\dfrac{2}{3}xy^4\right)^3\)

\(=\dfrac{1}{16}x^4y^2\cdot\dfrac{8}{27}x^3y^{12}\)

\(=\dfrac{1}{54}x^7y^{14}\)