Resposta:
a)
[tex] \dfrac{2}{9} = \dfrac{4 \div 2}{18 \div 2} \\ \\ \green{\dfrac{2}{9} = \dfrac{2}{9} \: (ok)}[/tex]
b)
[tex] \dfrac{7 \div 7}{28 \div 7} = \dfrac{1}{4} \\ \\ \green{\dfrac{1}{4} = \dfrac{1}{4} \: (ok) }[/tex]
c)
[tex] \dfrac{2 \div 2}{6 \div 2} = \dfrac{3 \div 3}{9 \div 3} \\ \\ \green{\dfrac{1}{3} = \dfrac{1}{3} \: (ok)}[/tex]
d)
[tex] \dfrac{4}{1} = \dfrac{12 \div 3}{3 \div 3} \\ \\ \dfrac{4}{1} = \dfrac{4}{1} \\ \\ \green{4 = 4 \: (ok)}[/tex]
Bons Estudos!
