32,6*5 1/4+1 1/5*8,5

32,6 * 5 1/4 + 1 1/5 * 8,5 = 181 7/20.

1) 32,6 * 5 1/4 = 32 6/10 * 5 1/4 = (32 * 10 + 6) / 10 * (5 * 4 + 1) / 4 = (320 + 6) / 10 * (20 + 1) / 4 = 326/10 * 21/4 = (326 * 21) / (10 * 4) = (163 * 2 * 21) / (10 * 2 * 2) = (163 * 21) / (2 * 10) = 3423/20 = 171 3/20;

2) 1 1/5 * 8,5 = 1 1/5 * 8 5/10 = (1 * 5 + 1) / 5 * (8 * 10 + 5) / 10 = (5 + 1) / 5 * (80 + 5) / 10 = 6/5 * 85/10 = (6 * 85) / (5 * 10) = (2 * 3 * 5 * 17) / (5 * 2 * 5) = (3 * 17) / 5 = 51/5 = 10 1/5;

3) 171 3/20 + 10 1/5 = 171 + 10 + 3/20 + (1 * 4) / (5 * 4) = 181 + 3/20 + 4/20 = 181 7/20.