所挂重物的质量/Kg
0
1
2
3
4
5
6
7
弹簧的长度/cm
12
12.5
13
13.5
14
14.5
15
15.5
4321+500= 13.2-5.2= × = 0.2×1.4=
8÷25%= + = 2.4÷ = ÷ =