↑https://www.khanacademy.org/math/pre-algebra/pre-algebra-factors-multiples/pre-algebra-lcm/v/least-common-multiple-exercise↑https://people.richland.edu/james/lecture/m116/polynomials/zeros.html
更多参考
↑https://www.khanacademy.org/computing/computer-science/cryptography/modarithmetic/a/the-euclidean-algorithm↑https://www.khanacademy.org/computing/computer-science/cryptography/modarithmetic/a/the-euclidean-algorithm↑http://csharphelper.com/blog/2014/08/calculate-the-greatest-common-divisor-gcd-and-least-common-multiple-lcm-of-two-integers-in-c/