8/3*5-12/5*7+16/7*9-20/9*11+24/11*13 急

问题描述:

8/3*5-12/5*7+16/7*9-20/9*11+24/11*13 急
求结果

8/3*5-12/5*7+16/7*9-20/9*11+24/11*13
=1/3+1/5-1/5-1/7+1/7+1/9-1/9-1/11+1/11+1/13
=1/3+1/13
=16/39Why?求超详细过程8/(3*5)=1/3+1/512/(5*7)=1/5+1/716/(7*9)=1/7+1/920/(9*11)=1/9+1/1124/(11*13)=1/11+1/13