1 1/5 * 6 1/4=6/5 * 25/4=30/4
30/4 : 5/4=30/4 * 4/5=6 - искомое число
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1 1/5 * 6 1/4=6/5 * 25/4=30/4
30/4 : 5/4=30/4 * 4/5=6 - искомое число