Помогите
1)6 2/5+4 1/15
2)3 1/7+5/14
3)1 2/21+2/3

1)6 2/5+4 1/15 = 6 6/15 + 4 1/15 = 10 7/152)3 1/7+5/14 = 3 2/14 + 5/14 = 3 7/14 = 3 1/23)1 2/21+2/3 = 1 2/21 + 14/21 = 1 16/21