[填空题]
A person stands on a bathros)pzl )4p:x7wqsdp2oi v;0ljom spwq*6(axs q0 * 9duktpcale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 90 *d*qutsp( aq6 xpwk0.75 of the person’s regular weight. Calculate the acceleration of the elevator, and find the direction of acceleration.
