Exercícios
http://www.auladoguto.com.br/aulas-e-textos/aprenda-adicao-de-fracoes-com-denominadores-iguaishttps://www.khanacademy.org/math/arithmetic/fractions/Adding_and_subtracting_fractions/e/adding_fractions_with_common_denominators
https://www.khanacademy.org/math/arithmetic/fractions/Adding_and_subtracting_fractions/e/subtracting_fractions_with_common_denominators
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