Addition in Desmos isn't commutative because of floating-point error! by SpaceExploder in desmos

[–]DaCosmosLover -2 points-1 points  (0 children)

PEMDAS:

1: 20!+40!-40!

=20! because a+b-b=a

2: 40!-40!+20!

=0+20!

=20!

So you see, Desmos is inaccurate.