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（选自教材,P71-P72,练习十七）,练习十七,1.,口算,2.5+0.9,7.8+1.6,0.39+0.15,1.2-0.5,4.7-2.8,0.96-0.33,=3.4,=9.4,=0.54,=0.7,=1.9,=0.63,4.1 2,3.6 4,+0.4 8,3.64+0.48=,21.56+6.74=,4.12,28.3,3.6 4,4.1 2,0.4 8,验算：,2 8.3 0,2 1.5 6,+6.7 4,2 1.5 6,2 8.3,6.7 4,验算：,2.,计算下面各题并验算。,1 7.0 4,7.8 5,+9.1 9,7.85+9.19=,41.2-15.6=,17.04,25.6,7.8 5,1 7.0 4,9.1 9,验算：,4 1.2,2 5.6,+1 5.6,2 5.6,4 1.2,1 5.6,验算：,8.2 4,4.6 8,+3.5 6,8.24-3.56=,11.65-7.39=,4.68,4.26,4.6 8,8.2 4,3.5 6,验算：,1 1.6 5,4.2 6,+7.3 9,4.2 6,1 1.6 5,7.3 9,验算：,3.,0.95-0.35=0.6,（,千克,）,杯里的水有多少千克？,答：杯里的水有,0.6,千克。,项 目,电话费,宽带费,合 计,4,月,83.54,元,80.00,元,5,月,79.26,元,80.00,元,总 计,4.,小丽家两个月的电话费和宽带费如下表，把表填写完整。,163.54,元,159.26,元,162.8,元,160,元,322.8,元,5.,1.37,9.8,14.5,+,8.95,6.28,5.74,=,10.32,16.08,20.24,6.52,62,0.7,-,3.44,17.7,0.25,=,3.08,44.3,0.45,6.,下面的计算正确吗？把错误的改正确。,1 6.2 9,12.5,+3.7 9,10.0,23.4,-13.4,3.7 4,5.0 0,-1.2 6,4.1 6,7.1 6,-3,7.,用小数计算下面各题。,5,元,6,角,2,分,+3,元零,9,分,1t30kg+980kg,4m35cm+5m70cm,10kg-4kg800g,4km800m-3km50m,6km-2km860m,8.71,元,2.01t,10.05m,5.2kg,1.75km,3.14km,8.,+,75.8+45.5=121.3,（元）,+,75.8+58=133.8,（元）,+,92.5+45.5=138,（元）,+,92.5+58=150.5,（元）,9.,一些女子田径项目的中国纪录和世界纪录（截至,2021,年,8,月）如下表，它们各相差多少？,2.09-1.97=0.12(m),7.52-7.01=0.51(m),22.63-21.76=0.87(m),76.80-71.68=5.12(m),72.28-6,7,.9,8,=,4,.3(m),10.79-10.49=0.3(秒),项目,跳高,跳远,铅球,铁饼,标枪,100m,中国纪录,1.97m,7.01m,21.76m,71.68m,67.98m,10.79,秒,世界纪录,2.09m,7.52m,22.63m,76.80m,72.28m,10.49,秒,10.,找规律填数。,（,1,）,0.2,0.4,0.6,0.8,，,_,，,_,。,（,2,）,1.11,1.16,1.21,1.26,，,_,，,_,。,（,3,）,4.363,4.366,4.369,4.372,，,_,，,_,。,（,4,）,7.897,7.892,7.887,7.882,，,_,，,_,。,1.0,1.2,1.31,1.36,4.375,4.378,7.877,7.872,
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