望有准确的回答.例:一辆匀速行驶的火车在距前面峭壁450米处鸣笛,经过2.5s后听到回声,求火车速度.(声速340m/s)正规因写成:v=t/s,.可否写成;设火车速度为v2.5×340+2.5v=2×450v=40
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![望有准确的回答.例:一辆匀速行驶的火车在距前面峭壁450米处鸣笛,经过2.5s后听到回声,求火车速度.(声速340m/s)正规因写成:v=t/s,.可否写成;设火车速度为v2.5×340+2.5v=2×450v=40](/uploads/image/z/2493659-11-9.jpg?t=%E6%9C%9B%E6%9C%89%E5%87%86%E7%A1%AE%E7%9A%84%E5%9B%9E%E7%AD%94.%E4%BE%8B%EF%BC%9A%E4%B8%80%E8%BE%86%E5%8C%80%E9%80%9F%E8%A1%8C%E9%A9%B6%E7%9A%84%E7%81%AB%E8%BD%A6%E5%9C%A8%E8%B7%9D%E5%89%8D%E9%9D%A2%E5%B3%AD%E5%A3%81450%E7%B1%B3%E5%A4%84%E9%B8%A3%E7%AC%9B%2C%E7%BB%8F%E8%BF%872.5s%E5%90%8E%E5%90%AC%E5%88%B0%E5%9B%9E%E5%A3%B0%2C%E6%B1%82%E7%81%AB%E8%BD%A6%E9%80%9F%E5%BA%A6.%EF%BC%88%E5%A3%B0%E9%80%9F340m%2Fs%EF%BC%89%E6%AD%A3%E8%A7%84%E5%9B%A0%E5%86%99%E6%88%90%EF%BC%9Av%3Dt%2Fs%2C.%E5%8F%AF%E5%90%A6%E5%86%99%E6%88%90%EF%BC%9B%E8%AE%BE%E7%81%AB%E8%BD%A6%E9%80%9F%E5%BA%A6%E4%B8%BAv2.5%C3%97340%2B2.5v%3D2%C3%97450v%3D40)
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