Determina, usando a calculadora
Ainda os números: Matematicamente Falando 8 - Parte 1 Pág. 115 Ex. 33
Enunciado
Determina, usando a calculadora e apresentando o resultado em notação científica:
Determina, usando a calculadora e apresentando o resultado em notação científica:
- $3,7\times {{10}^{29}}-7,4\times {{10}^{30}}$
- $5,02\times {{10}^{-27}}+7,89\times {{10}^{-26}}$
- $(4,5\times {{10}^{13}})\div (1,5\times {{10}^{-21}})$
- $1,025\times {{10}^{17}}\times 8,2\times {{10}^{-2}}$
Resolução
-
$\begin{array}{*{35}{l}}
3,7\times {{10}^{29}}-7,4\times {{10}^{30}} & = & 0,37\times {{10}^{30}}-7,4\times {{10}^{30}} \\
{} & = & (0,37-7,4)\times {{10}^{30}} \\
{} & = & -7,03\times {{10}^{30}} \\
\end{array}$
-
$\begin{array}{*{35}{l}}
5,02\times {{10}^{-27}}+7,89\times {{10}^{-26}} & = & 5,02\times {{10}^{-27}}+78,9\times {{10}^{-27}} \\
{} & = & (5,02+78,9)\times {{10}^{-27}} \\
{} & = & 83,92\times {{10}^{-27}} \\
{} & = & 8,392\times {{10}^{-26}} \\
\end{array}$ -
$\begin{array}{*{35}{l}}
(4,5\times {{10}^{13}})\div (1,5\times {{10}^{-21}}) & = & \frac{4,5\times {{10}^{13}}}{1,5\times {{10}^{-21}}} \\
{} & = & \frac{4,5}{1,5}\times \frac{{{10}^{13}}}{{{10}^{-21}}} \\
{} & = & 3\times {{10}^{34}} \\
\end{array}$ -
$\begin{array}{*{35}{l}}
1,025\times {{10}^{17}}\times 8,2\times {{10}^{-2}} & = & (1,025\times 8,2)\times ({{10}^{17}}\times {{10}^{-2}}) \\
{} & = & 8,405\times {{10}^{15}} \\
\end{array}$
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