题目

The other day I walked along with my friends towards the cafeteria and outside I could see a crowd made up mostly of girls. I couldn't make out what was happening． We came closer and were able to see that a lady was cutting a girl's hair． Beside there was a poster which encouraged people to donate about 10 inches of their hair in order to make wigs （假发） for patients who suffered from cancer and had lost all or most of their hair．I was moved by the courage of those girls who were excitedly waiting their turn to get their hair cut． My friends sensed this and asked me if I was con直接写出得数．0.5+0.05=0.54+0.21=2-0.3=7.4-3.2=4.8-3=5.6+3=