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Openai/6774a241-20ac-800d-b611-75ce556f5e00
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=== Assistant: 要快速计算 397+128397 + 128397+128,我们可以应用 加法结合律 和 分解法。以下是详细的步骤和提示: === 要快速计算 397+128397 + 128397+128,我们可以应用 加法结合律 和 分解法。以下是详细的步骤和提示: # 分解数字: - 将 397397397 分解为 400−3400 - 3400−3。 - 保持 128128128 不变。 公式变为: (400−3)+128(400 - 3) + 128(400−3)+128 # 先计算容易的部分: - 400+128=528400 + 128 = 528400+128=528。 # 然后减去分解的部分: - 528−3=525528 - 3 = 525528−3=525。 最终结果为: 397+128=525397 + 128 = 525397+128=525 提示: * 通过将数字分解为整百数和小数部分,可以简化计算步骤。 * 应用结合律: (a+b)+c=a+(b+c)(a + b) + c = a + (b + c)(a+b)+c=a+(b+c),让加法顺序更有利于计算。 希望这个解释帮助您在速算中更快、更准确!
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