Question

Elimine os parênteses:

a) + ( – 3 + 8 )

b) – ( – 3 + 8 )

c) – ( – 3 – 1 )

d) – ( – 6 + 4 – 1 )

e) – 6 – ( – 3 + 2 )

f) 18 – ( – 5 – 2 – 3 )

g) 20 – ( – 6 + 8 ) – ( – 1 + 3 )

h) – 32 – 1 – ( – 12 + 14 )

i) 7 + ( – 5 – 6 ) – ( – 9 + 3 )​

Answer 1

Resposta:

a)

$+ ( - 3 + 8) = \\ = - 3 + 8 \\ = \green{ + 5}$

b)

$- ( - 3 + 8) = \\ = + 3 - 8 \\ = \green{ - 5}$

c)

$- ( - 3 - 1) = \\ + 3 + 1 \\ = \green{+ 4}$

d)

$- ( - 6 + 4 - 1) = \\ = + 6 - 4 + 1 \\ = + 2 + 1 \\ = \green{+ 3}$

e)

$- 6 - ( - 3 + 2) = \\ = - 6 + 3 - 2 \\ = - 3 - 2 \\ = \green{ - 5}$

f)

$18 - ( - 5 - 2 - 3) = \\ = \red{18 + 5 }+ \blue {2 + 3 }\\ = + \red{ 23 }+ \blue5 \\ = \green{ + 28}$

g)

$20 - ( - 6 + 8) - ( - 1 + 3) = \\ = 20 -( + 2) - ( + 2) \\ = \red{ 20 - 2} - 2 \\ = \red{18} - 2\\ = \green{16}$

h)

$- 32 - 1 - ( - 12 + 14) = \\ = - 33 - ( + 2) = \\ = - 33 - 2 \\ = \green{- 35}$

i)

$7 + ( - 5 - 6) - ( - 9 + 3) = \\ = 7 + ( - 11) - ( - 6) \\ = \red{7 - 11} + 6 \\ = \red{ - 4} + 6 \\ = \green{+ 2}$

Bons Estudos!