9/4√48÷(3/8√16/5)
=6√（48÷16/5）
=6√15
5x√xy ÷2√y ²/x×1/x√xy
=5x√xy *1/x√xy÷2√y²/x
=5√x²y²÷2√y²/x
=5/2√x³
=5/2x√x
√-45x×√-10y÷1/10√x/y
=√450xy÷1/10x/y
=10√450y²
=-150y√2
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