4+2/5=4 2/5
21+7/8=21 7/8
25/8+5/8=30/8 или 3 6/8
8/7+16/21=40/21 или 1 2/21
2/5+7=7 2/5
3/4+9/16=21/16 или 1 5/16
4+2/5=4 2/5
21+7/8=21 7/8
25/8+5/8=30/8 или 3 6/8
8/7+16/21=40/21 или 1 2/21
2/5+7=7 2/5
3/4+9/16=21/16 или 1 5/16