Question
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Вычислите: \( \frac{124,5^{2}-106,5^{2}}{64^{2}-44^{2}} \) A) 71

Ask by Reed Newton. in Kazakhstan
Feb 19,2025

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Answer

Результат: 1.925

Solution

Calculate or simplify the expression \( (124.5^2-106.5^2)/(64^2-44^2) \). Calculate the value by following steps: - step0: Calculate: \(\frac{\left(124.5^{2}-106.5^{2}\right)}{\left(64^{2}-44^{2}\right)}\) - step1: Remove the parentheses: \(\frac{124.5^{2}-106.5^{2}}{64^{2}-44^{2}}\) - step2: Convert the expressions: \(\frac{\left(\frac{249}{2}\right)^{2}-106.5^{2}}{64^{2}-44^{2}}\) - step3: Convert the expressions: \(\frac{\left(\frac{249}{2}\right)^{2}-\left(\frac{213}{2}\right)^{2}}{64^{2}-44^{2}}\) - step4: Subtract the numbers: \(\frac{4158}{64^{2}-44^{2}}\) - step5: Subtract the numbers: \(\frac{4158}{2160}\) - step6: Reduce the fraction: \(\frac{77}{40}\) Результат: \( \frac{124.5^{2}-106.5^{2}}{64^{2}-44^{2}} = 1.925 \)

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Давайте сначала упростим данное выражение, используя формулу разности квадратов \(a^2 - b^2 = (a-b)(a+b)\). Для числителя: \[ 124,5^2 - 106,5^2 = (124,5 - 106,5)(124,5 + 106,5) = 18 \cdot 231 = 4158 \] Теперь для знаменателя: \[ 64^2 - 44^2 = (64 - 44)(64 + 44) = 20 \cdot 108 = 2160 \] Теперь подставим значения в исходное выражение: \[ \frac{4158}{2160} \] При делении 4158 на 2160 это приблизительно равно 1,93, что явно не соответствует предложенному варианту ответа A) 71. Проверим еще раз: \[ \frac{4158}{2160} \approx 1,93 \] Ответ не равен 71. Возможно, ошиблись в интерпретации данных чисел или в вариантах ответа.

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