1 (sqrt(2) + sqrt(3) - sqrt(7)
_____________________________________________
(sqrt (2) + sqrt(3) + sqrt(7) ) (sqrt(2) + sqrt(3) - sqrt(7))
(sqrt(2) + sqrt(3) -sqrt(7)
__________________________________________________________
2 + sqrt(6) - sqrt(14) + sqrt(6) + 3 - sqrt(21) + sqrt(14) + sqrt(21) - 7
sqrt(2) + sqrt(3) - sqrt(7) (2sqrt(6) + 2)
___________________________________
(2sqrt(6) - 2) (2sqrt(6) + 2)
2sqrt(12) + 2sqrt(2) + 2sqrt(18) + 2sqrt(3) - 2sqrt(42) - 2sqrt(7)
____________________________________________________
24 - 4
2sqrt(12) +2sqrt(2) + 2sqrt(18) + 2sqrt(3) - 2sqrt(42) - 2sqrt(7)
_____________________________________________________
20
sqrt(12) + sqrt(2) + sqrt(18) + sqrt(3) - sqrt(42) - sqrt(7)
_________________________________________________
10
2sqrt(3) + sqrt(2) + 3sqrt(2) + sqrt(3) - sqrt(42) - sqrt (7)
__________________________________________________
10
4sqrt(2) + 3sqrt(3) - 1sqrt(7) - 1sqrt(42)
_____________________________
10
A + B + C + D + E + F =
4 + 3 - 1 - 1 + 42 + 10 =
57