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3/7 * 28/1 =
1/3 * 15/4 =
1 1/7 * 2 1/4= 8/7 * 9/4 =


3 3/1 * (2 1/4 - 1 1/2 :5) =






37 281 13 154 1 17 2 14 87 94 3 31 2 14 1 12 5 class=