\[\boxed{\ \mathbf{1442}\mathbf{\ (1124)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ \left( 16\frac{5}{11} + 5\frac{6}{11} \right) \cdot 3,245 =\]
\[= 71,39\]
\[16\frac{5}{11} + 5\frac{6}{11} = 21\frac{11}{11} = 22\]
\[2)\ (4,8 - 3,762)\ :0,06 = 17,3\]
\[3)\ (3,47 + 3,46) \cdot (3,47 - 3,46) =\]
\[= 6,93 \cdot 0,01 = 0,0693\]
\[4)\ (6,3 - 4,2)\ :(6,3 + 4,2) =\]
\[= 2,1\ :10,5 = 21\ :105 = 0,2\]