\[1\frac{1}{2} \cdot 2\frac{10}{13} + 2\frac{3}{4} \cdot 2\frac{10}{13} - 2\frac{10}{13} \cdot 3\frac{1}{6} =\]
\[= 2\frac{10}{13} \cdot \left( 1\frac{1 \cdot 6}{12} + 2\frac{3 \cdot 3}{12} - 3\frac{1 \cdot 2}{12} \right) =\]
\[= \frac{36}{13} \cdot \left( 1\frac{6}{12} + 2\frac{9}{12} - 3\frac{2}{12} \right) = \frac{36}{13} \cdot \frac{13}{12} =\]
\[= \frac{36 \cdot 13}{13 \cdot 12} = \frac{36}{12} = 3.\ \]