2-6/13÷9/26-2/3=2-6/13x26/9-2/3=2-4/3-2/3=2-(4/3+2/3)=2-2=0
2➖6/13➗9/26➖2/3=2➖2/3➖6/13✖️6/9=6/3➖2/3➖2/1✖️2/3=4/3➖4/3=0:6/3是通分后的数。