Question

(13-2).3+5 ?
(4+2.5)-3?
15+[6+(8-4:2)]??
(7+2).(3-1) ???
20-(15+6:3) ???
40-[3(10-2):2]???
pra agora pfvr !!!!

Answer 1

Vamos lá
a) 
(13 - 2).3 + 5
11.3+5
33 + 5
   38

b)
(4+2.5) - 3
4+ 10-3
14-3
  11

c)
15+[6+(8-4:2)]
15+ [6+8 - 2]
15+12
   27

d)
(7+2).(3-1)
   9.2
    18

e) 
20-(15+6:3)
20-(15+2)
20 -15-2
20-17
   3

f)
40-[3(10-2):2]
40 - (30 - 6):2 
40 - 24:2
40 - 12
   28

bons estudos.