(12,75- 1 2/3*1,4):(2,2+6 2/15)=

(12,75- 1 2/3*1,4):(2,2+6 2/15)= (12 3/4 - 5/3 *7/5):(2 1/5 + 6 2/15)= (12 3/4 - 7/3):(2 3/15+6 2/15)= (12 9/12 - 28/12):8 5/15= (10 33/12 - 28/12): 8 1/3 = 10 5/12 : 8 1/3= 125/12 : 25/3 = 125/12 * 3/25 = 5/4 = 1 1/4

Odp w załączniku ;]