1、1.用简便方法计算下面各题。0.2516.24 (1.250.125)8 3.6102 3.723.56.283.5 15.62.115.61.1 4.810.12.（1）李明星期天帮奶奶买了2千克白萝卜和2千克豆角，一共花了多少钱？（2）买5千克白萝卜，10元钱够吗？3.试一试：（用简便方法计算）9.161.530.05391.6参考答案：1. 0.2516.24 =0.25416.2=116.2=16.2 (1.250.125)8=1.258 0.1258=101=93.6102 =3.6（1002）=3.61003.62=3607.2=367.23.723.56.283.5 =（3.72
2、6.28）3.5=103.5=35 15.62.115.61.1=15.6（2.11.1）=15.61=15.64.810.1=4.8（100.1）=4.8104.80.1=480.48=48.482.（1）1.9023.802 =3.807.60 =11.40（元）或者（1.903.80）2 =5.702 =11.40（元）（2）1.905=9.50（元）9.50元10元9.161.530.05391.6=9.161.530.539.16=9.16（1.530.53）=9.161=9.16够了。3. 9.161.530.05391.6或者=91.60.1530.05391.6=91.6（0.1530.053）=91.60.1=9.16
