Resposta:

Explicação passo a passo:

1/3=10/30

2/3=20/30

5/2=75/30

1/5=6/30

1/3+2/3-5/2-1/5=

10/30+20/30-75/30-6/30=

30/30-75/30-6/30=

-45/30-6/3=

-51/30= [simplifica por 3]

-17/10