Answers

2015-07-25T11:27:40+08:00
Like this 1+[-1]=0
Because when you add with a negative number its like subtraction.Now when you 
subtract a negative from a positive ex. 2-[-1] it will become now adding so it will look like this 2+1=3 but if 2 is the negative number ex. -2-1 then the answer will be a negative number -2-1=2+1=-3
0