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三个同学抬一捆书籍，手中的工具只有两根扁担和绳子．他们都不希望自己负担过重，最好每个人肩负的力都相等．那么，怎样应用物理知识才三人平分@张丽
3. The three classmates carried a bundle of books. The tools in their hands were only two poles and cords. They don't want to overburden themselves. It's best for everyone to have the same power. So, how to use physics knowledge to split three people @ Li Zhang