[填空题]
A person stands on a bathroom scale in a motionless u q8p(ssj- j9televatoreof(o7t)ri;m+u (cpl dj*p a;. When the elevator begins to move, the scale briefly reads only 0.75 of the person’s regular weight. Calculate the acceleration of the elevator, and find the direction of accelu( + f)(;7p;*omicrepdot jl aeration.
