А) 4 + 5 1/4 = 4 + 21/4 = 4*4 +21 = 16 +21 = 37/4 = 9 1/4
4 4
б) 1 2/9 + 3 1/3 = 11/9 + 10/3 = 11 + 10*3 = 11 +33 = 44/9 = 4 8/9
9 9
в) 1 3/5 + 2 2/3 = 8/5 + 8/3 = 8*3 + 8*5 = 24 + 40 = 64/15 = 4 4/15
15 15
г) 5 3/4 - 2 = 23/4 - 2 = 23 - 2*4 = 23-8 = 15/4 = 3 3/4
4 4
д) 3 - 5/7 = 3*7 - 5 = 21 - 5 = 16/7 = 2 2/7
7 7
е) 4 - 1 7/9 = 4 - 16/9 = 4*9 - 16 = 36 - 16 = 20/9 = 2 2/9
9 9
ж) 3 2/5 - 3/5 = 17/5 - 3/5 = 17 - 3 = 14/5 = 2 4/5
5
з) 4 1/3 - 1 1/2 = 13/3 - 3/2 = 13*2 - 3*3 = 26 - 9 = 17/6 = 2 5/6
6 6