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文[1]提出了两个定理,并用文中的两个定理证明了四个例题,但其中例3解法是错误的,笔者首先指出例3的错误,并给出一种正确证明,最后谈点看法.
In [1], two theorems are proposed, and four examples are proved by two theorems in the paper. However, the solution of Example 3 is wrong. The author first points out the error of Example 3 and gives a correct proof. Finally, view.