Answer
(a) $x^2$
(b) $y^2$
Work Step by Step
(a) $x^{3/4}x^{5/4}=x^{3/4+5/4}=x^{2}$
(b) $y^{2/3}y^{4/3}=y^{2/3+4/3}=y^{2}$
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