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20 10 how to do the last question in the second group of the second grade of the national middle school students' mathematical ability competition
Because the product of 71311is 10 1.
Let two digits be ab (ten digits are A and one is B).
Then10101* ab = ababab.
That is to say,
Ababab divided by 7 divided by 13 divided by 1 1 1=ab.