The article introduces a method in which the order of quadratic integral can be exchanged with the knowledge of elementary.
给出了一种代数法交换积分次序的方法，避免了作积分区域图的麻烦。
The article introduces a method in which the order of quadratic integral can be exchanged with the knowledge of elementary.
给出了一种代数法交换积分次序的方法，避免了作积分区域图的麻烦。
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