√ 6
8 + 8 + 8 = 8 × 3 , 9 + 9 + 9 = 9 × 3 . или 8 × 3 = 24 , 9 × 3 = 27
√ 7
18 - 9 = 9. , 9 + 9 = 18. , 13 + 5 = 18
13 - 4 = 9. , 8 + 7 = 15. , 15 + 4 = 19 . ,
( 60 + 6 ) - 4 = 62
1) 60 + 6 = 66
2) 66 - 4 = 62
( 50 + 8 ) + 2 = 60
1) 50 + 8 = 58
2) 58 + 2 = 60