13/11*11/26+13/2简便计算

问题描述:

13/11*11/26+13/2简便计算

  13/11*11/26+13/2
  =13/2+13/2
  =13/43/8-15/19*8/3怎么做?3/8+1/15×3/8=3/8×(1+1/15)=3/8×16/15=2/5