2/3, 3/2, 7/5, 5/7, 9/4, 4/9, 11/7, 7/11, 3/5, 5/3, 7/8, 8/7, 13/9, 9/13, 5/11, 11/5, 10/4, 4/10, 13/21, 21/13.

ส่วนกลับของเศษส่วน_ป.5

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