Question

Necesito resolver las siguientes expresiones:
(-2).(-5)-(2),
2/5+3/2,
(-15)/(-3).(-5),
(2+5)-(-3)

Answer 1

(-2).(-5)-(2)=10-2=8
2/5+3/2=(4+15)/10=19/10
(-15)/(-3).(-5)=-15/15=-1
(2+5)-(-3)=7+3=10

Answer 2

aplicando ley de signos 
10-2=8
(4+15)/10=19/10
-15/15=-1
7+3=10