\[\boxed{\mathbf{6.}}\]
\[1)\ 7 + 7 + 7 + 7 + 7 + 7 + 7 =\]
\[= 49\]
\[7 \cdot 7 = 49\]
\[2)\ 7 + 7 + 7 + 7 + 7 + 7 + 7 + 7 =\]
\[= 56\]
\[7 \cdot 8 = 56\]
\[7 \cdot 9 = 63\]
\[7 \cdot 10 = 70\]