Question

-3{[-4 • (-2-5•4+5-3]}= ?

-20• {-18•[(-1) • (4-7)]}=??

[(-8) • (-1)+(+2)]•(+18):(-2)=??

Answer 1

Olá,

Vamos lá,

=-3{[-4 • (-2-5•4+5-3]}
=-3{[-4 • (-2-20+5-3]}
=-3{-4 • -20}
=-3. 80
= -240


=-20• {-18•[(-1) • (4-7)]}
=-20• {-18•[(-1) • (-3)]}
=-20• {-18•3}
=-20. -54
= 1.080


=[(-8) • (-1)+(+2)]•(+18):(-2)
=[8+2)]•-9
= 10 . -9
= -90