\[43 \cdot 88 + 12 \cdot 17 + 12 \cdot 26 =\]
\[= 43 \cdot 88 + 12 \cdot (17 + 26) =\]
\[= 43 \cdot 88 + 12 \cdot 43 = 43 \cdot (88 + 12) =\]
\[= 43 \cdot 100 = 4300\]
\[Ответ:4300.\]