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