My handwriting explaination


  • 0
    Z

    Let us first look at the following proof,forgive my poor English,I just want to explain it clearly.
    0_1489804467812_微信图片_20170318103108.jpg

    so,every time we add up the digits ,we get the same result that mod 9.notice that if this number is multiple of 9, it mod 9 get 0,but it is result should be 9.following is the summary
    1_1489804467812_微信图片_20170318103101.jpg


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