不难理解的几个定理： Theorem 9.8 Let (g,h)G x H.If g and h have finite orders r and s respectively,then the order of (g,h)in Gx H is the least common multiple of r and s. Corollary 9.9 Let (91,...,9n)EIIGi.If gi has finite order ri in Gi,then the order of (g,...,gn)in IIGi is the least common multiple of ri,...,rn. 问题6：如果诸ri互素，会有什么结论？不难理解的几个定理： 问题6：如果诸ri互素，会有什么结论？