Question

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Answer 1

1) 3$\sqrt{81x3y4} = 3.9\sqrt{x2xy4}= 27xy^{2} \sqrt{x}$

2) 2xy$\sqrt[3]{128x2y8}=2xy \sqrt[3]{64.2x2y6y2}=2xy.4 y^{2} \sqrt[3]{2x2y2}=8x y^{3} \sqrt[3]{2x2y2}$