45,09 : 1,5 - (7/2 * 9/2 - 2,5 * 5/2 ) : 17/4 =
= 30,06 - (63/4 - 5/2 * 5/2 ) * 4/17 =
= 30 ,06 - (63 -25)/4 * 4/17 =
= 3006/100 - 38/4 * 4/17 =
= 1503/50 - 38/17 =
= (1503 * 17 - 38*50 ) / (50*17) =
= (25551 - 1900)/850 =
= 23651/850 = 27 целых 701/850