(3/15-2 7/25):1 2/25+1 4/13
1) 3/15 - 2 7/25 = 30/150 -2 42/150 = -2 12/150 = -2 2/25 2)-2 2/25 : 1 2/25 = -52/25 : 27 /25 = - 52/27 = -1 25/27 3)-1 25/27 +1 4/13 = -1 325/351 + 1 108/351 = - 217/351