выполните дейстия 1)2 целых 49/72*15-25целых 7/12； 2) 24целых 13/16+8 целых3/4*11；3) 5целых 11/20*8+6целых 3/10；4)7целых 83/90*27-156 целых 4/15
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1) 2 целых 49/72 * 15 - 25 целых 7/12 = 14 целых 5/82 49/72 * 15 = 193/72 * 15 = (193*5)/24 = 965/24 = 40 целых 5/24
40 5/24 - 25 7/12 = 39 29/24 - 25 14/24 = 14 15/24 = 14 5/8
2) 24 целых 13/16 + 8 целых 3/4 * 11 = - 71 целая 7/16
8 3/4 * 11 = 35/4 * 11 = 385/4 = 96 целых 1/4
24 13/16 - 96 1/4 = 24 13/16 - 96 4/16 = - (95 20/16 - 24 13/16) = - 71 7/16
3) 5 целых 11/20 * 8 + 6 целых 3/10 = 50 целых 7/10
5 11/20 * 8 = 111/20 * 8 = 888/20 = 44 8/20 = 44 целых 4/10
44 4/10 + 6 3/10 = 50 целых 7/10
4) 7 целых 83/90 * 27 - 156 целых 4/15 = 57 целых 19/30
7 83/90 * 27 = 713/90 * 27 = (713*3)/10 = 2139/10 = 213 целых 9/10
213 9/10 - 156 4/15 = 213 27/30 - 156 8/30 = 57 целых 19/30