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natulia [17]
3 years ago
13

Write -0.5 repeating as a fraction in simplest form​

Mathematics
2 answers:
mario62 [17]3 years ago
4 0
The answer is 5/9.
(P.S. I got the step by step solution from a Socratic Question and Answer website)

Semmy [17]3 years ago
4 0

let's start by making the expression the recurring value, and then we'll multiply it by some power of 10 so that we move the recurring decimal over to the left, and then again by a power of 10 so we move a second part of the recurring decimal over, let's proceed,

\bf x = 0.\overline{5}~\hfill \begin{array}{llll} 10\cdot x&=&5.\overline{5}\\\\ 100\cdot x&=&55.\overline{5} \end{array}~\hfill \begin{array}{rllll} \stackrel{100x}{55.\overline{5}}\\\\ -\stackrel{10x}{5.\overline{5}}\\\cline{1-1} 50 \end{array} \\\\[-0.35em] ~\dotfill\\\\ 100x-10x=50\implies 90x=50\implies x=\cfrac{50}{90}\implies x=\cfrac{5}{9}\implies \stackrel{x = -0.\overline{5}}{x=-\cfrac{5}{9}}

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