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2 1/4 - (9/4)² : √(9/4) 2 1/4 - 81/16 : 3/2 2 1/4 - 81/16 * 2/3
(3/4)² * 4/9 9/16 * 4/9
---------------- = ----------------- = 1/4 : (-9/8) = 1/4 * (-8/9) = -2/9
9/4 - 27/8 18/8 - 27/8