\[\boxed{\text{6.238.}}\]
\[\textbf{а)}\ 4,807 \cdot 100 = 480,7\]
\[34,9 \cdot 100 = 3\ 490\ \]
\[0,7 \cdot 100 = 70\]
\[\textbf{б)}\ 4,5697 \cdot 1\ 000 = 4\ 569,7\ \]
\[0,0071 \cdot 1\ 000 = 7,1\ \]
\[0,5 \cdot 1\ 000 = 500\ \ \]