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= 9/4 x 3 1/4 ÷ 11/2
= 9/4 x 13/4 ÷ 11/2
= 9/4 x 13/4 = 117/4
117/4 : 11/2
= 117/4 : 2/11
= 117/22
= 5 7/22
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