Operações com frações

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https://wordwall.net/pt/resource/35570508/matem%c3%a1tica/soma-de-fra%c3%a7%c3%b5es

https://wordwall.net/pt/resource/16795487/mathematics/soma-e-subtra%c3%a7%c3%a3o-de-fra%c3%a7%c3%b5es-com-denominadores

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