\[\boxed{\mathbf{6.}}\]
\[1)\ 0\ и\ 5:\]
\[50,\ 55.\]
\[2)\ 6\ и\ 7:\]
\[66,\ 67,\ 76,\ 77.\]
\[\boxed{\mathbf{7.}}\]
\[1)\ 0\ и\ 3:\]
\[300,\ 303,\ 330,\ 333.\]
\[2)\ 4\ и\ 5:\]
\[444,\ 445,\ 454,\ 455,\ \]
\[555,\ 554,\ 545,\ 544.\]
\[\boxed{\mathbf{8.}}\]
\[\mathbf{1.2.\ Римские\ цифры}\]
\[\boxed{\mathbf{1.}}\]
\[1)\ 4 + 3 \cdot 7 = 4 + 21 = 25\]
\[2)\ (36 - 12)\ :3 = 24\ :3 = 8\]
\[3)\ 54\ :(36\ :4) = 54\ :9 = 6\]
\[4)\ 36 - 12\ :3 = 36 - 4 = 32\]
\[5)\ 81\ :9 \cdot 3 = 9 \cdot 3 = 27\]
\[6)\ 4 \cdot (12 + 3) = 4 \cdot 15 = 60\]
\[\boxed{\mathbf{2.}}\]
\[I - 1\]
\[V - 5\]
\[X - 10\]
\[L - 50\]
\[C - 100\]
\[D - 500\]
\[M - 1000\]