原式=√(81/45)÷√(27/20)×[1/2√(8/3)] =√[(81/45)÷(27/20)]×√(8/12) =√[(4/3)×(2/3)] =√(8/9) =2/3√2
(9√1/45)÷(3/2√3/5)*(1/2√2又2/3)
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