(21/22-5/11)-(22/39-3/13)=?

Question

(21/22-5/11)-(22/39-3/13)=?

Answer 1

(21/22-10/22)-(22/39-9/39)=0,5-0,(3)=0,8(3)

Answer 2

1)21/22-5/11=21/22-10/22=11/22;
2)22/39-3/13=22/39-9/39=13/39;
3)11/22-13/39=429/858-286/858=143/858=1/6.

Comments

Спасибо))