Решите дроби 2/5+7/15 2/5+9/10 2/5+3/8 2/5+1 1/5 2/5+2/9

Question

Решите дроби
2/5+7/15
2/5+9/10
2/5+3/8
2/5+1 1/5
2/5+2/9

Answer 1

2/5 + 7/15 = 6/15 + 7/15 = 13/15
2/5 + 9/10 = 4/10 + 9/10 = 13/10 = 1 3/10
2/5 + 3/8 = 16/40 + 15/40 = 31/40
2/5 + 1 1/5 = 1 3/5
2/5 + 2/9 = 18/45 + 10/45 = 28/45

Answer 2

2/5+7/15=3/15+7/15=10/15=2/3
2/5+9/10=4/10+9/10=13/10=1 целая 3/10.
2/5+3/8=16/40+15/40=31/40
2/5+1 1/5=13/5=2 целых 3/5
2/5+2/9=18/45+10/45=28/45