11/15*-10/11*-9/10+-7/9*-6/7+4/15

Question

11/15*-10/11*-9/10+-7/9*-6/7+4/15

Answer 1

1) 11/15*-10/11= -2/3
2) -2/3*-9/10= 3/5
3) 7/9*-6/7=-2/3
4) -2/3+4/15 = 14 / 15
5) 3/5+14/15= 23/15=1 целая 8/15