(1)3.4-2.8=0.6(元) 4.0-3.4=0.6(元) 答:苹果的单价比梨子贵0.6元,比香蕉便宜0.6元. (2)1.9+2.8=4.7(元) 10-4.7=5.3(元) 答:应找回5.3元钱.