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Theresab2021
21.04.2020 •
Mathematics
A rectangular prism has base edge lengths of 6" and 8". The base edge lengths of a right rectangular prism are 8" and 6". The base of a right triangular prism is a right triangle with perpendicular sides of 24" and 8" long.The height, h in feetof the triangular prism is half the height of the rectuangular prism. The volume of the triangular prism is?
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Ответ:
32
Step-by-step explanation:
We begin by writing both $0.\overline{6}$ and $0.\overline{60}$ as fractions.
Let $r=0.\overline{6}$. Then $10r=6.\overline{6}=6+r$, so $9r=6$ and $r=\frac{6}{9}=\frac{2}{3}$.
Let $s=0.\overline{60}$. Then $100s=60.\overline{60}=60+s$, so $99s=60$ and $s=\frac{60}{99}=\frac{20}{33}$.
Therefore, $x = r\cdot s = \frac{2}{3}\cdot \frac{20}{33} = \frac{40}{99}$.
We can convert $\frac{40}{99}$ to a decimal by long division:
$$
\begin{array}{*{8}{[email protected]{}} l}
&& 0 & . & 4 & 0 & 4 & 04 & \ldots \\
\cline{2-9}
99 & | & 40 & . & 0 & 0 & 0 & 00 & \ldots \\
&& 39 && 6 \\
\cline{3-5}
&&&& 4 & 0 & 0 \\
&&&& 3 & 9 & 6 \\
\cline{5-7}
&&&&&& 4 & 00 \\
&&&&&& 3 & 96 \\
\cline{7-8}
&&&&&&& 4 \\
&&&&&&& \vdots
\end{array}
$$
The repeating pattern of remainders explains why the decimal for $\frac{40}{99}$ will continue to repeat, giving us
$$\frac{40}{99} = 0.\overline{40} = 0.404040404040404\ldots~.$$The first $15$ digits after the decimal point are eight $4$s and seven $0$s, so their sum is $8\cdot 4 = \boxed{32}$.