Вычислите (2/5-2/3)-(3/7-3/5)

Question

Вычислите (2/5-2/3)-(3/7-3/5)

Answer 1

= (6/15 -10/15) - ( 15/35 - 21/35)= (-4/15)-(-6/35)=6/35-4/15=18/105-28/105= -10/105