Условие:

327
439
568
836
28 + 8
57 + 7
1002
1006

327 = (30 + 2) − 7 = 2 + (307) = 2 + 23 = 25
 
439 = (40 + 3) − 9 = 3 + (409) = 3 + 31 = 34
 
568 = (50 + 6) − 8 = 6 + (508) = 6 + 42 = 48
 
836 = (80 + 3) − 6 = 3 + (806) = 3 + 74 = 77
 
28 + 8 = 28 + 2 + 6 = 30 + 6 = 36
 
57 + 7 = 57 + 3 + 4 = 60 + 4 = 64
 
1002 = (90 + 10) − 2 = 90 + (102) = 90 + 8 = 98
 
1006 = (90 + 10) − 6 = 90 + (106) = 90 + 4 = 94