1除以2除以3除以4除以5除以6除以7除以8除以9=2.8
问题描述：
1除以2除以3除以4除以5除以6除以7除以8除以9=2.8
1/2/3/4/5/6/7/8/9=2.8 它们中间可以用( ) 如;1/2/(3/4/5)/6/(7/8)/9=.
答
共有5种算法：
1/(2/3)/4/(5/6/7/8)/9=2.8
1/(2/(3/4))/(5/6/7/8)/9=2.8
1/(2/(3/4/5)/6/7/(8/9))=2.8
1/(2/(3/4/(5/6))/7/(8/9))=2.8
1/(2/(3/4/(5/6/7))/(8/9))=2.8