5/(7/9)/(9/11)/(11/21)=
问题描述:
5/(7/9)/(9/11)/(11/21)=
答
5/(7/9)/(9/11)/(11/21)=5*9/7*11/9*21/11=5*21/7=15
5/(7/9)/(9/11)/(11/21)=
5/(7/9)/(9/11)/(11/21)=5*9/7*11/9*21/11=5*21/7=15