13÷13/17-13/17÷13=13×17/13-13/17×1/13=17-1/17=16+16/17=16 16/17
=13×17/13-13/17×1/13=17-1/17=288/17
解,原式=13×17/13-13/17×1/13 =17-1/17 =288/17