Question

(-312) + (-327)+ (-28) +27=

Answer 1

`(-312) + (-327)+ (-28) +27`

`=-312 -327-28+27`

`=(-327+27)-312-28`

`=-300 -312-28`

`=-612-28`

`=-640`

Answer 2

`[79]`

`= (-312 - 28) + (-327 + 27)`

`= -340 - 300`

`= -640`

Answer 3

\(\left[\left(-312\right)+\left(-28\right)\right]+\left(-327+27\right)\) 

\(=-340+\left(-300\right)=-640\)

Answer 4

\(\left(-312\right)+\left(-327\right)+\left(-28\right)+27\)

\(=-639-28+27=-667+27=-640.\)