Question

Calculle o valor das expressões

A) -{+15-[(-4+20)-20]-17}
B) 3×(-4)+(-5)×(-6)×(-2)+(-4)×(-7)

Answer 1

-{15-[(16)-20]-17}
-{15-[-4]-17}
-{15+4-17}
-{2}
-2
reposta: -2

3*(-4)+(-5)*(-6)*(-2)+(-4)*(-7)=
-12-60+28=
-72+28=
  -44

Answer 2

A) -{+15-[(-4+20)-20]-17}
=-{+15-[(16)-20]-17}
=-[+15-(16-20)-17]
=-[+15-(-4)-17]
=-(+15+4-17)
=-(19-17)
=-(2)
-2

B) 3×(-4)+(-5)×(-6)×(-2)+(-4)×(-7)
=-12-60+28
=-72+28
=-44