用递等式计算,怎样简便就怎样计算.53.2÷(6.5-2又1/4÷8又1/2)

53.2÷(6.5-9/4÷17/2)
=53.2÷(6.5-9/34)
=53.2÷[(13×17-9)/34]
=266/5×34/(13×17-9)
=266/5×17/106
=133/5×17/53
=2261/265