Respuesta :

[tex]\bf \cfrac{7}{10}\div \cfrac{-2}{5}\implies \cfrac{7}{\underset{2}{~~\begin{matrix} 10 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}}\cdot \cfrac{~~\begin{matrix} 5 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}{-2}\implies -\cfrac{7}{4}[/tex]

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