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lie fang cheng zu jie ying yong ti de she yuan fa
Pages: 29-30
Year: Issue:  12
Journal: Required Reading for Junior Middle School Students

Abstract: <正>合理设元是列疗程组解应用题的关键一环,现举例介绍四种设元方法.一、直接设元法这是一种要求什么就设什么的设元方法.例1一列快车长168米,一列慢车长184米,若两车相向而行,则从相遇到离开需4秒;若同向而行,则从快车追及慢车到离开需16秒.求两车的速度.
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