3/5-1/3-2/9 дробная черта 7/15+2/3-4/5=?

Question

3/5-1/3-2/9 дробная черта 7/15+2/3-4/5=?

Answer 1

3/5-1/3-2/9=(27-15-10)/45=2/45
7/15+2/3-4/5=(7+10-12)/15=5/15
(2/45)/5/15=2/15