(21,85: 43,7+8ц.1/2: 3ц.2/5): 6,3+1ц.11/21=?

(21,85 : 43,7 + 8 1/2 : 3 2/5) : 6,3 + 1 11/21 = 2

1) 21,85 : 43,7 = 0,5
2) 8 1/2 : 3 2/5 = 17/2 : 17/5 = 17/2 * 5/17 = 5/2 = 2,5
3) 0,5 + 2,5 = 3
4) 3 : 6,3 = 30/63 = 10/21
5) 10/21 + 1 цел 11/21 = 1 + 21/21 = 1 + 1 = 2