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
д) 57/37 * 74/76= 6/4= 1 целая 2/4= 1 целая 1/2
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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
д) 57/37 * 74/76= 6/4= 1 целая 2/4= 1 целая 1/2