Ответы и объяснения

2013-12-11T17:00:37+04:00
2 5/8: 3+ 2 1/4: 9- 3 3/4: 9= 21/8: 3/1+ 9/4: 9/1- 15/4: 9/1= 21/8* 1/3+ 9/4* 1/9- 15/4* 1/9= 21/24+ 9/36- 15/36= 7/8+ 1/4- 5/12= 21/24+ 6/24- 10/24= 17/24