а) 9/10 * 5/6 = 3/4
б) 6/25 * 20/21 = 8/35
в) 17/30 * 26/51 = 13/45
г) 40/7 * 14/5 = 16
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а) 9/10 * 5/6 = 3/4
б) 6/25 * 20/21 = 8/35
в) 17/30 * 26/51 = 13/45
г) 40/7 * 14/5 = 16