a,
\(\left(-\dfrac{1}{3}\cdot x\right)^2\cdot y\cdot2\cdot xy^3 \)
\(=\left(-\dfrac{1}{3}\right)^2\cdot x^2y\cdot2xy^3\)
\(=\left(-\dfrac{1}{9}\right)\cdot2\cdot\left(x^2\cdot x\right)\cdot\left(y\cdot y^3\right)\)
\(=-\dfrac{2}{9}\cdot x^3\cdot y^4\)
b,\(=\left(\dfrac{1}{4}\cdot x\right)^2.\left(-2\right)\cdot x^3y^5\)
=\(\dfrac{1}{4}^2\cdot x^2y\cdot\left(-2\right)\cdot x^3y^5\)
=\(\dfrac{1}{16}\cdot\left(-2\right)\cdot\left(x^3\cdot x^2\right)\cdot\left(y\cdot y^5\right)\)
=\(-\dfrac{1}{8}\cdot x^5y^6\)
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