Question

Resolva: (desenvolvimento da conta necessário)
a) (12+12.-5)-18 =
b) 20-{3.[2.(3+9)]} =
c) 312:{48+[(3.4+12):(4.2-2)] =

Answer 1

a) (12+12.-5)-18 =

(12-60)-18 =

-48-18 = -66

b) 20-{3.[2.(3+9)]} =

20-{3.[2.12]} =

20-{3.24} =

20-72 = -52

c) 312:{48+[(3.4+12):(4.2-2)]} =

312:{48+[(12+12):(8-2)]} =

312:{48+[24:6]} =

312:{48+4} =

312:52 = 6