3.2+2.5
6.6
8.8-0.2
5.5+3.1
4.17
8.9-2.3
4.03+2.57
5.7
6.29-2.12
3.12+1.05
8.6
6.9-1.2
汽车刹车做匀减速直线运动,那么,它的( )
选出正确的答句( )