Question

efetue as operações :

a) (+5)+(-3)

b) (-12)-(+3)-(-20)

c) (13-4)-8

d) {5- [32- (50-20) ] }

e) (+21) • (-12)

f) (-7) • (+2) • (+1)

g) (+5) • (10+3)

h) (+30) ÷ (+10)

i) (-10) ÷ (-1)

j) 3-7 • 3

k) 5+ 2 • 8

l) 2² + 3³​

ajuda please!!

Answer 1

Explicação passo-a-passo:

a) ( +5 ) + ( -3 ) = 5 - 3  = +2

b) ( -12 ) - ( +3 ) - ( -20 )  = -12 - 3 + 20 = -15 + 20 = +5

c) ( 13 - 4 ) - 8 = ( +9 ) - 8 = +1

d) { 5 - [ 32 - ( 50 - 20 )]} = { 5 - [ 32 - ( +30 )]} = { 5 - [ +2 ]} = 5 - 2 = +3

e) ( +21 ) • ( -12 ) = -252

f) ( -7 ) • ( +2 ) • ( +1 ) = ( -14 ) • ( +1 ) = -14

g) ( +5 ) • ( 10 + 3 ) = ( +5 ) • ( 13 ) = +65

h) ( +30 ) ÷ ( +10 ) = +3

i) ( -10 ) ÷ ( -1 ) = +10

j) 3 - 7 • 3 = 3 - 21 = -18

k) 5 + 2 • 8 = 5 + 16 = +21

l) 2² + 3³​ = 4 + 27 = +31