練習十七,義務教育人教版四年級下冊,小數的加法和減法,6,1.口算。,2.50.9,7.81.6,1.20.5,4.72.8,0.390.15,0.960.33,3.4,9.4,0.7,1.9,0.54,0.63,2.計算下面各題并驗算。,3.640.48,21.566.74,4.12,28.3,7.859.19,41.215.6,8.243.56,11.657.39,17.04,25.6,4