((6 3/5 - 3 3/14) * 5 5/6) : ((21 - 1,25) : 2,5) = 2,5
1) 6 3/5 - 3 3/14 = (6 - 3) + (42/70 - 15/70) = 3 27/70
2) 3 27/70 * 5 5/6 = 237/70 * 35/6 = 79/2 * 1/2 = 79/4 = 19,75
3) 21 - 1,25 = 19,75
4) 19,75 : 2,5 = 7,9
5) 19,75 : 7,9 = 2,5
((6 3/5 - 3 3/14) * 5 5/6) : ((21 - 1,25) : 2,5) = 2,5
1) 6 3/5 - 3 3/14 = (6 - 3) + (42/70 - 15/70) = 3 27/70
2) 3 27/70 * 5 5/6 = 237/70 * 35/6 = 79/2 * 1/2 = 79/4 = 19,75
3) 21 - 1,25 = 19,75
4) 19,75 : 2,5 = 7,9
5) 19,75 : 7,9 = 2,5