If you are talking about constant, given a constant of pie 22/7,
is equal to another pie of 22/7, what ever that come along to
create the unequality will be the external values, from current of
batteries to manufacturing of the meters, your tyre wheels
diameter, air pressure, roundness, the co efficient of the engines,
tachometer, speedometer and finally, the human factors.
Let take all these values into a factor Z
so pie = pie
given a Z factor
therefore, pie x Z =/= pie x Z
有料，有墨水！
佩服！佩服！