一根圆木质量为30千克,假如它的直径增加一倍,长度缩小一半,质量该是多少?要有算是
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![一根圆木质量为30千克,假如它的直径增加一倍,长度缩小一半,质量该是多少?要有算是](/uploads/image/z/13577210-26-0.jpg?t=%E4%B8%80%E6%A0%B9%E5%9C%86%E6%9C%A8%E8%B4%A8%E9%87%8F%E4%B8%BA30%E5%8D%83%E5%85%8B%2C%E5%81%87%E5%A6%82%E5%AE%83%E7%9A%84%E7%9B%B4%E5%BE%84%E5%A2%9E%E5%8A%A0%E4%B8%80%E5%80%8D%2C%E9%95%BF%E5%BA%A6%E7%BC%A9%E5%B0%8F%E4%B8%80%E5%8D%8A%2C%E8%B4%A8%E9%87%8F%E8%AF%A5%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E8%A6%81%E6%9C%89%E7%AE%97%E6%98%AF)
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