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JS的基本数据类型有哪些?

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下面的代码能实现交换两个变量的值吗?如果不能实现请改写代码实现,并写出运算结果。

设方阵A的一个特征值为2，则矩阵2A+3E的一个特征值为__

Jakob Co. purchased an asset for $100,000 on 1.1.20X1. It had an estimated useful life of 5 years and it was depreciated using the reducing balance method at a rate of 40%. On 1.1.20X3 it was decided to change the method to straight line.Show the depreciation charge for each year (to 31 December) of the asset’s life.

Question:1. What is the purpose of depreciation2. In what circumstances is the reducing balance method more appropriate than the straight line method? Gives reasons for your answer