Question

(35 - 17) - (1315 - 12) - 121 пожалусто решите

Answer 1

3/5-1/7=(21-5)/7*5=16/35
13/15-1/2=(26-15)/15*2=11/30
16/35-11/30-1/21=(16*6-11*7-10)/210=9/210=3/70