\( 1 \cdot (2 + 4) : 2 = 3 \)
\( 22 + 35 - (31 \cdot 2) = 25 \)
\( 42 : 21 \cdot 60 - 31 = 89 \)
\( 44 : (34 + 10 + 2) = 1 \)