Question

1) Realizar a subtração das frações abaixo:
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Answer 1

$\boxed{\begin{array}{l}\sf\dfrac{3}{9}=\dfrac{3\div3}{9\div3}=\dfrac{1}{3}\\\sf\dfrac{3}{3}-\dfrac{3}{9}=\dfrac{3}{3}-\dfrac{1}{3}=\dfrac{2}{3}\end{array}}$