一、简便计算。
2.53.60.9
12.50.38.8
1.25(100－8)
2.06＋2.0699
9.5101
42(5.250.25)
1.298
2.41.250.3
50(6.70.02)
0.2799＋0.27
2.53.20.125
3.41.01
6.51.98
6.80.750.5
1.53+23.47.2
4.711－4.7
4.8＋5.24
2.851.250.8
10.50.2512
4.050.5－1.14
1.5899＋1.58
12.50.42.58
0.873.16+4.64
12.54.8
12.53.20.25
3.45102
12.5 88
13.650.256
28.986.3 -3.15
二、运算定律。
6.8（1.2+0.5）0.04
7.26－5.4＋1.74－1.6
100－2.70.36－2.55
0.461.9＋0.541.9
20.64－9.83－0.17
7.75[20(3.24-3.04)]
23.47.2＋6.50.8
4.74.7+4.76.3－4.7
3.20.82＋3.21.18
22.9－13.68＋12.68
4.27.8+2.24.2
43.2－1.83－4.6
10.01－2.78＋1.59
5.37-（2.37＋1.8）
（20－0.89) 5.7
13.750.1252.75
28.86.3－6.318.8
8.4－8.41.51.8
三、混合连式。
（1.62＋1.62＋1.62＋1.62）1.82.5
2.80.5＋0.528.2－0.5
3.22.51.25 (93) 7.2[（7.22－6.4）0.9]
4.6532+2.546.5+0.465430
7.2567.875+7250.7875+72500.053375
0.4＋12.60.280.2
0.813－3.12＋5.28
118－(11.4－12.50.8)
12.54.5+4.512.5+12.5
（0.25＋2.5＋25）0.4
3.51.02+350.098
13.52.50.1250.48
2.614.5＋2.616.5－2.61