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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,0.63,9,3.5,0.7,0.7,0.8,0.5,0.14,3.4,2,6.3,2.1,40.5,6.8,1.7,0.56,14,6.7,3.3,0.32,0.04,0.25,0.05,1口算0.63 9 3.50.70.70.8,1,整数加减法,小数加减法,相同点,不同点,都要把相同数位对齐,也就是把相同数位上的数相加减,都要从低位算起。,末位对齐,只要把小数点对齐,整数加减法小数加减法相同点不同点 都要把相同数位对齐,也,2,在一个减法算式里,被减数,减数和差,的和是,19.8,,那么被减数是()。,在一个减法算式里,被减数,减数和差,3,在括号里填上适当的数。,0.120.3=,( ),3 6.720.28=,( ),28,0.120.03=,( ),3 0.6720.28=,( ),28,1.2,12,672,67.2,在括号里填上适当的数。0.120.3=( )3,4,算一算,比一比已知86X7=602, 117,36=32.5,8.67,8.60.7,0.860.7,11.7,3.6,117,0.36,11.7,36,算一算,比一比已知86X7=602, 11736=32,5,判断题,8.6410025=8.644,2.80.50.8=2.8(0.50.8),两个因数相乘,所得的积一定大于其中的一个因数。,18.04保留一位小数和整数的结果都是18.,1.3除以0.3的商是4,余数是1.,判断题,6,比一比,3.05x0.9,3.05,3.05x1.1,3.05,4.5,0.9,4.5,4.5,1.1,4.5,比一比3.05x0.93.053.05x1.13.05,7,12.5X(8-0.8) 13.6+2.98-3.6,8.4X2.5,12.5X(8-0.8) 13.6+2.98-3.6,8,
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