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Sagot :
Conta parte por parte!
[tex]\begin{matrix}\space\space&\textbf{4}&\textbf{7}&\textbf{6}\\ \times \:&1&8&\textbf{8}\end{matrix}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&4&\space\space\\ \space\space&4&7&\textbf{6}\\ \times \:&1&8&\textbf{8}\end{matrix}}{\begin{matrix}\space\space&\space\space&\space\space&8\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&6&\textbf{4}&\space\space\\ \space\space&4&\textbf{7}&6\\ \times \:&1&8&\textbf{8}\end{matrix}}{\begin{matrix}\space\space&\space\space&0&8\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&3&\textbf{6}&4&\space\space\\ \space\space&\space\space&\textbf{4}&7&6\\ \times \:&\space\space&1&8&\textbf{8}\end{matrix}}{\begin{matrix}\space\space&\space\space&8&0&8\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&\textbf{4}&\textbf{7}&\textbf{6}\\ \space\space&\times \:&1&\textbf{8}&8\end{matrix}}{\begin{matrix}\space\space&3&8&0&8\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&\space\space&4&\space\space\\ \space\space&\space\space&4&7&\textbf{6}\\ \space\space&\times \:&1&\textbf{8}&8\end{matrix}}{\begin{matrix}\space\space&3&8&0&8\\ \space\space&\space\space&\space\space&8&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&6&\textbf{4}&\space\space\\ \space\space&\space\space&4&\textbf{7}&6\\ \space\space&\times \:&1&\textbf{8}&8\end{matrix}}{\begin{matrix}\space\space&3&8&0&8\\ \space\space&\space\space&0&8&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&3&\textbf{6}&4&\space\space\\ \space\space&\space\space&\textbf{4}&7&6\\ \times \:&\space\space&1&\textbf{8}&8\end{matrix}}{\begin{matrix}\space\space&3&8&0&8\\ \space\space&8&0&8&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&3&6&4&\space\space\\ \space\space&\space\space&4&7&6\\ \times \:&\space\space&1&8&8\end{matrix}}{\begin{matrix}\space\space&3&8&0&8\\ 3&8&0&8&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&\textbf{4}&\textbf{7}&\textbf{6}\\ \space\space&\times \:&\textbf{1}&8&8\end{matrix}}{\begin{matrix}\space\space&3&8&0&8\\ 3&8&0&8&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&\space\space&4&7&\textbf{6}\\ \space\space&\space\space&\times \:&\textbf{1}&8&8\end{matrix}}{\begin{matrix}\space\space&\space\space&3&8&0&8\\ \space\space&3&8&0&8&\space\space\\ \space\space&\space\space&\space\space&6&\space\space&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&\space\space&4&\textbf{7}&6\\ \space\space&\space\space&\times \:&\textbf{1}&8&8\end{matrix}}{\begin{matrix}\space\space&\space\space&3&8&0&8\\ \space\space&3&8&0&8&\space\space\\ \space\space&\space\space&7&6&\space\space&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&\space\space&\textbf{4}&7&6\\ \space\space&\space\space&\times \:&\textbf{1}&8&8\end{matrix}}{\begin{matrix}\space\space&\space\space&3&8&0&8\\ \space\space&3&8&0&8&\space\space\\ \space\space&4&7&6&\space\space&\space\space\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\space\space&\space\space&4&7&6\\ \space\space&\space\space&\times \:&1&8&8\end{matrix}}{\begin{matrix}\space\space&0&3&8&0&8\\ \space\space&3&8&0&8&0\\ \space\space&4&7&6&0&0\end{matrix}}[/tex]
[tex]\frac{\begin{matrix}\space\space&\textbf{1}&1&\space\space&\space\space&\space\space\\ \space\space&\textbf{0}&3&8&0&8\\ \space\space&\textbf{3}&8&0&8&0\\ +&\textbf{4}&7&6&0&0\end{matrix}}{\begin{matrix}\space\space&\textbf{8}&9&4&8&8\end{matrix}}[/tex]
[tex]47,6\mathrm{\:possui\:}1\mathrm{\:casa\:decimal}\\\\18,8\mathrm{\:possui\:}1\mathrm{\:casa\:decimal}\\\\\mathrm{Portanto,\:a\:resposta\:possui\:}2\mathrm{\:casas\:decimais}\\\\894,88[/tex]
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