[1¾ ÷{1¼ -½(2¼ -⅒)}]÷(½ of 4½)
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[13/4÷{ 5/4-1/2(9/4-1/10)}]÷(1/2of 9/2)
=[13/4÷{5/4-1/2( 33/20 )}]÷9/4
= [13/4÷{3/4×33/30}] ÷ 9/4
=[13/4÷33/40]÷9/4
= 130/33÷9/4
=520/297
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