十万里加急！！！ 高中数学题！！！！！ 求助 大神， 希望有高人 耐心指点， thx 希望　我能早早的　被　贵人　找到！ 因为 本人 打速成 很慢， 所以都用 拼音。 求解下题 并 提供 列式, 列式，因为这很重要， 能解说一下更好。?

Question 9

Polynomials and Multiples of 9

It is easy to find the multiples of 9 from 1 to 100. But can you easily find the multiples of 9 for numbers larger than 100 or even 10 000 without using a calculator?

In order to determine whether a number is a multiple of 9, we can add up all digits in the number. If the sum is divisible by 9, then the number is a multiple of 9.
e.g. (i) Consider 171. Sum of all digits = 1+7+1= 9 , so 171 is a multiple of 9.
(ii) Consider 123 123 123. Sum of all digits = 1 +2 +3 +1 +2 +3 +1 +2 +3 =18 since 18 is a multiple of 9. so 123123123 is a multiple of 9.
(iii) Consider 100 001. Sum of all digits = 1+０＋０＋０＋０＋１＝　２
ｓｉｎｃｅ　　２　ｉｓ　ｎｏｔ　ａ　ｍｕｌｔｉｐｌｅ　ｏｆ　９．　
ｓｏ　　１００　００１　　ｉｓ　ｎｏｔ　ａ　ｍｕｌｔｉｐｌｅ　ｏｆ　９．
Ｉｎ　ｆａｃｔ，　ｗｅ　ｃａｎ　ｕｓｅ　ｔｈｅ　ｋｎｏｗｌｅｄｇｅ　ｏｆ　ｐｏｌｙｎｏｍｉａｌｓ　ｔｏ　ｐｒｏｖｅ　ｔｈａｔ　ｔｈｅ　　　　ａｂｏｖｅ　ｍｅｔｈｏｄ　ｗｏｒｋｓ．

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