I couldn't understand exactly what you were asking, you here are multiple answers.
1+2+1+8 = 12
1 x 2 + 1 x 8 = 10
1/2 + 1/8 = 5/8
Sorry If That Wasn't What You Were Looking For.
Hope That Helps You Out
-FemaleKickboxer O3O
1 + 2 + 6 + 8 = 17
(1 + 8)*(8 + 2) = 90
let 1+2+4+8+...... =s s= 1+2(1+2+4+8+........) s=1+2s s=-1 but sum of infinite terms cannot be -1 so, what's the answer
It is: -9+8+(-5)+3+1 = -2
9+8--2+3 9+8-1 (-2+3 is 1) 9+7 (8-1 is 7) therefore the answer is... 16
1 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 46
32
2
7/8 1/2 + 1/4 + 1/8 = 4/8 + 2/8 + 1/8 = 7/8
it is 1 and 5 out of 8
3 1/8 + 1 1/2 + 1/2 = 3 + 1/8 + 1 + 1/2 + 1/2 = 3 + 1/8 + 1 + 1 = 5 1/8 = 5.125
1 and 7/8 + 2 and 3/8 = 4 and 1/4