[填空题]
A person stands on a bathrt;)/kevl 7 8e04a sywvua 2dia:moh7poom scale in a mo 6c+j i-qcq3pyu( 4b8q4ek fsztionless elevator. When the elevator begins to move, the scale briefly reads only 0.75 of the person’s regular weight. Calculate 46c- u3qp ysij(qb fkc 4q+z8ethe acceleration of the elevator, and find the direction of acceleration.
