3, 1, +, 3, x, 9, 5, -, 2, +, /, 3, 7, 4, -, x, 6, +, -

             A
            / \
         __/   \___
        /          \
       B           G
      / \         / \
     C   D       H   K
        / \     / \
       E   F   I   J

(image missing)