2/3, 11/12 − 1/4 = ?, 5/8, 7/8 − 1/4 = ?, 1/9, 7/9 − 2/3 = ?, 3/5, 9/10 − 3/10 = ?, 1/4, 3/4 − 1/2 = ?, 1/2, 5/6 − 1/3 = ?

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