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\frac{1}{2} = \frac{10}{20} => \frac{25}{50}= \frac{10}{20} " alt=" \frac{25}{50}= \frac{25:25}{50:25}= \frac{1}{2}\\\\ \frac{1}{2}= \frac{1*10}{2*10}= \frac{10}{20} => \frac{1}{2} = \frac{10}{20} => \frac{25}{50}= \frac{10}{20} " align="absmiddle" class="latex-formula">