Olá, yasmin, tudo bem?
[tex]\frac{7}{1} \times \frac{2}{4} \\\\7\times\frac{2}{4} \\\\7\times \frac{2(1)}{4}\\\\7\times\frac{2\times1}{2\times2} \\\\7\times\frac{1}{2}\\\\\frac{7}{2}[/tex]
