Ответы и объяснения

2014-03-04T12:09:08+04:00
1. 
1) 5/8 + 11/36=20/36 + 11/36 = 31/36
2) 31/36 * 6/67 = 31/402
2.
1) 3/8 * 5 = 15/8
2) 4 1/6 * 2 1/10 = 25/6 * 21/10 =  105/12
3) 9/20 * 6 = 54/20 = 2,7
4) 15/8 + 105/12 = 60/36 + 315/36 = 375/36
5) 375/36 - 27/10 = 1875/180 - 486/180 = 1389/180 = 7 43/60