Question

12,2+(-7 целых 2/5)+(-4 целых 5/6)+(-39 целых 1/2)+50

Answer 1

12,2+(-7  2/5)+(-4  5/6)+(-39  1/2)+50=12,2-7,4-4 5/6+39,5=15,3-4 5/6=  
=11,3-5/6=11 3/10-5/6=11 9/30-25/30=11-16/30=11-8/15=10 7/15