(1/2-1/5)+(4/15-7/30)помогите ?????????!!!!!!

Question

(1/2-1/5)+(4/15-7/30)



помогите ?????????!!!!!!

Answer 1

(1/2-1/5)+(4/15-7/30)= (5/10-2/10)+(8/30-7/30)= 3/10+1/30=9/30+1/30=10/30=1/3