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➕➖ Regra de sinais: você sabe quando o resultado é positivo ou negativo? Na multiplicação e na divisão de números positivos e negativos, existe uma regra fundamental que você precisa dominar! 📌 Sinais iguais → resultado positivo. 📌 Sinais diferentes → resultado negativo. 🎯 Essa regra é essencial para resolver expressões numéricas, equações e diversos outros conteúdos da matemática. ⚠️ Mas atenção: essa regra não deve ser aplicada diretamente à adição e à subtração! Cada operação possui suas ...
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