a) \(=9x^4\left|y\right|\)
b) \(=\dfrac{14}{xy}.\dfrac{3xy^2}{7}=6y\)
d) \(=\left|x-5\right|\)
e) \(=-6y\sqrt{x}-2y\sqrt{x}+3y\sqrt{x}=-5y\sqrt{x}\)
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