Mathematics, 19.07.2021 17:20 tbair5417
Uma maneira de realizar a operação 9972 - 9 de forma rápida e correta é calculando 1 000 * 994, que é igual a 994 000. A igualdade que justifica esse fato está expressa em:
a) (a + b)² = a² + b² + 2ab
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b) a² - b² = (a + b)(a - b)
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c) a² - b² = (a - b)²
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d) (a - b)² = a² - 2ab + b²
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e) a² - b² = 1 000(a + b)
Answers: 2
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Uma maneira de realizar a operação 9972 - 9 de forma rápida e correta é calculando 1 000 * 994, que...
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