Question

Пж помогите 10 баллов

Answer 1

-1/3+3/4=3/4-1/3=9/12-4/12=5/12
-1/3+(-3/4)=-1/3-3/4=-4/12-9/12=-13/12=-1 1/12
1/3+(-3/4)=1/3-3/4=4/12-9/12=-5/12