①17.5-3.56+6.44
②120.39-87.62-12.38
③4.9+5.1-13.7+2.3
④32.17-0.45-4.17
5.27-(0.27+3.26)=5.27
4.8+1.99=4.8(2 )
0.7+2.61.9+2.6
2.8+3.63.6+2.8
4-3.5+0.54-(3.5+0.5)
7.5-3.3+0.57.5-0.5+3.3
12.78+5.2+4.8
18.17-2.9-3.1
9.85+4.7-9.85+6.3
27.3+73.2+72.7 7.6-5.59+2.04 43.25-10.4-3.25
3.8+1.37+6.2+12.63 76.38-27.74-12.36
废旧物品
饮料罐
废旧纸张
废旧电池
矿泉水瓶
质量/千克
25.3
43.26
5.71
6.74