速度(千米/时)
1
2
3
4
5
6
时间(时)
12
2.4
32.8+17.2= 902﹣457= 6×1.2=
0.32÷0.4= -= +=
5.4÷0.09= 7.75+3.86-7.75+1.14= 2.5×0.99×0.4=
26.2+38= 40×0.1÷0.001= 56.27- 3.73-46.27=