\[\boxed{\mathbf{2}\mathbf{.}\mathbf{154}}\]
\[\textbf{а)}\ 50 \cdot 2 = 100 - 58 = 42\ :14 =\]
\[= 3 + 21 = 24\ :12 = 2\]
\[\textbf{б)}\ 32 + 58 = 90\ :6 = 15 - 2 =\]
\[= 13 \cdot 5 = 65 + 35 = 100\]
\[\textbf{в)}\ 32 - 27 = 5\ :5 = 1 + 9 =\]
\[= 10 \cdot 16 = 160 - 12 = 148\]
\[\textbf{г)}\ 6 \cdot 12 = 72 + 28 = 100\ :10 =\]
\[= 10 - 6 = 4 \cdot 15 = 60\]
\[\textbf{д)}\ 32\ :16 = 2 \cdot 25 = 50 + 34 =\]
\[= 84\ :12 = 7 \cdot 10 = 70\]