若a大于0,b小于0,则b分之a________0,b分之-a________0,-b分之a________0.

问题描述:

若a大于0,b小于0,则b分之a________0,b分之-a________0,-b分之a________0.

若a大于0,b小于0,则b分之a<0,b分之-a>0,-b分之a>0