There is only one possibility: Tuesday, September 1,

So; September 30th is:

30- 1=29, 29÷7=4 ... remainder 1,

September 30th is Wednesday.

This year, 65438+ 10 1 is Thursday.

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Olympiad Mathematics: Students' thinking should occupy an important position in the process of learning mathematics. Thinking is formed on the basis of learning mathematical knowledge and mastering methods, and it is the result of the interaction between mathematical knowledge and students' subjective understanding. Thinking training has become an important part of current mathematics teaching. In order to enable students to acquire mathematical thinking ability, it is necessary to use students' existing mathematical concepts to deal with new problems flexibly. Students can know mathematical objects and master new knowledge through mathematical judgment and reasoning. Based on this idea, we have compiled this set of teaching materials for math teachers and students to choose from.