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+\documentclass[12pt,a4paper]{article}
+\usepackage[spanish]{babel}
+\usepackage{amsmath}
+
+\title{Tema I: Ejercicio I}
+\author{Nicolás A. Ortega Froysa}
+
+\begin{document}
+\maketitle
+
+\begin{align*}
+	d_{p} = \sqrt{1080^{2} + 1920^{2}} = 2202.907 \simeq 2203 \\
+	d_{i} = 32 \\
+	PPI = \frac{d_{p}}{d_{i}} = \frac{2203}{32} = 68.84375
+\end{align*}
+
+\end{document}
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+\documentclass[12pt,a4paper]{article}
+\usepackage[spanish]{babel}
+\usepackage{amsmath}
+
+\title{Tema I: Ejercicio I}
+\author{Nicolás A. Ortega Froysa}
+
+\begin{document}
+\maketitle
+
+\begin{align*}
+	d_{p} = \sqrt{1080^{2} + 1920^{2}} = 2202.907 \simeq 2203 \\
+	d_{i} = 40 \\
+	PPI = \frac{d_{p}}{d_{i}} = \frac{2203}{40} = 55.075
+\end{align*}
+
+\end{document}