Give it =0.1+0.2-0.3 and it will see what you are trying to do and return 0.
Give it anything slightly more complicated such as =(0.1+0.2-0.3) and this won't trip, in this example displaying 5.55112E-17 or similar.
https://people.eecs.berkeley.edu/~wkahan/Mind1ess.pdf
(and plenty of other rants...:
https://people.eecs.berkeley.edu/~wkahan/ )
Give it =0.1+0.2-0.3 and it will see what you are trying to do and return 0.
Give it anything slightly more complicated such as =(0.1+0.2-0.3) and this won't trip, in this example displaying 5.55112E-17 or similar.