7/9÷11/5+2/9×5/11=7/9×5/11+2/9×5/11=(7/9+2/9)×5/11=5/11.
7/9÷11/5+2/9×5/11=7/9×5/11+2/9×5/11=﹙7/9+2/9﹚×5/11=1×5/11=5/11
(7/9)/(11/5)+(2/9)*(5/11)=5/11