\( 6 + 4 = 10 \)
\( 7 - 3 = 4 \)
\( 9 + 3 + 4 = 16 \)
\( 3 + 2 = 5 \)
\( 5 + 2 = 7 \)
\( 8 - 6 + 4 = 6 \)
Ответ: +, -, +, +, +, -.