\[\boxed{\mathbf{1101\ (1092)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ \frac{3}{7}b\left( - 14t - \frac{7}{9}y + 2\frac{1}{3}c \right) =\]
\[= - 6bt - \frac{1}{3}yb + bc\]
\[2) - 1,2xy \cdot\]
\[\cdot \left( 5m - 6c + \frac{1}{6}t - \frac{5}{6} \right) =\]
\[= - 6xym + 7,2xyc -\]
\[- 0,2xyt + xy\]
\[3)\ 0,3mn \cdot\]
\[\cdot (1,5 - 6bc + 7b - 10c) =\]
\[= 0,45mn - 1,8mnbc +\]
\[+ 2,1mnb - 3mnc\]