化简好后是七分之一乘以(十三分之八+十三分之六)=十三分之二
8/13÷7 5/7×1/13=8/13×1/7 1/7×5/13=(8/13 5/13)×1/7=1×1/7=1/7
8/13÷7+1/7×6/13=8/13×1/7+1/7×6/13=1/7×(8/13+6/13)=1/7×14/13=2/13
8/13÷7+1/7×6/13=8/13×1/7+1/7×6/13=1/7×(7/13+6/13)=1/7×1=1/7