(7 / 11 + 8 / 15) - (7 / 11-7 / 15)

(7 / 11 + 8 / 15) - (7 / 11-7 / 15)


(7/11+8/15)-(7/11-7/15)
=7/11+8/15-7/11+7/15
=(7/11-7/11)+(8/15+7/15)
=0+1
=1
This is a simple method, of course, you can also use the method of sharing, but it's very boring