四年级口算（2）（2页）.docx

四年级口算（2）1.加法运算律和减法的运算性质中的口算。364555231617632537125(2550)258875187257553(2847)25028222乘法运算律和除法的运算性质中的口算。9125825374(257)456127562735(27)4925900254540363411161125(84)3小数点的位置移动中的口算。4.52108.971000.09810012102.003100020.521000.28101001.710010000.54100104小数加减法中的口算。70.70.90.80.61.20.79 14.60.348.243.76 1.38.564.13.8 0.80.552.10.2 2.130.020.30.7 3.510.27.50.5 10.20.31.121.02 3.70.95.64.6 4.50.01答案51365612550188871282006900037001285600490900915550300745.28979.81.220030.2052280175.4871.61.41.9914.26129.860.30.252.32.1113.71710.50.12.810.24.49