单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,1、口算：,0.80.5=1.60.38=10.75=0.480.03=,61.2=42.5=0.5614=0.920.4=,630452 28035 0.5614,2、这三道题有没有更简便的方法,0.4,1.98,0.25,5,10,0.04,2.3,16,=7,=8,=0.04,5.635,5.635,5.675,0.85,0.16,更多全套课件免费下载：,绿色圃中小学教育网,http:/,9.30.50.6,你认为哪种方法更简便？,方法一：,9.30.50.6,18.60.6,31,9.30.50.6,9.3（0.50.6）,9.30.3,31,方法二：,用简便方法计算：,5.44.8 7.24.5724.8 0.423.5 0.2540.25,8.41.250.810.40.252,在括号里填上适当的数：,