(3 2/3+1 3/4): (6 7/12-2 1/4)*0,8 по действиям

(3 2/3+1 3/4):(6 7/12-2 1/4)*0,8=18 7/9
3 2/3+1 3/4=3 8/12+1 9/12=4 17/12=5 5/12
6 7/12-2 1/4=6 7/12-2 3/12=4 4/12=4 1/3
5 5/12:4 1/3=65/12:13/3=65/12*13/3=845/36
845/36*0,8=676/36=169/9=18 7/9