said the ball is a general problem and the strict answer. It is precisely because of the need for general and strictly, it is necessary to consider many peacetime on without coming to the special circumstances, the narrative is relatively more complicated. If the reader to the strict proof of a lack of interest can only read and agreed on the first mark, II, III and the end of 27 examples of the ball, and V 13 balls and 40 balls in the paper. Indeed, all the skills have been reflected in several of the examples.

称球问题1.txt
称球问题2.txt
称球问题3.txt
称球问题4.txt
称球问题5.txt
称球问题补.txt

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