二、用竖式计算。
20.3 - 15.6 31.4 + 16.5 44.1 - 21.8
7.2 + 18.8 20.8 - 11.9 56.6 + 5.8
19.1 - 16.5 17.8 + 24.4 35.3 - 8.6
64.3 + 15.7 41.2 - 26.5 12.4 + 27.9
33.2 - 28.6 50.4 - 34.9 30.5 + 19.6
24.7 + 35.8 39.3 - 27.4 71.6 - 54.8

二、4.7 47.9 22.3
26 8.9 62.4
2.6 42.2 26.7
80 14.7 40.3
4.6 15.5 50.1
60.5 11.9 16.8