1.통분, 공통분모 2.6분의4, 12분의8, 12, 12분의10, 24분의6, 24분의20, 12, 24 3.3, 12, 5, 18분의6, 21분의7, 24분의8, 6, 9, 16, 20분의15, 24분의18, 12분
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