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1、用竖式计算下面各题3.5+0.35= 10-0.25=17+1.7= 12.47=2.312= 0.150.65=2.46.2= 0.560.04=6.70.3= 0.560.04=3.74.6= 0.290.07=6.58.4= 56+1.3=322.5= 2.61.08=0.877= 3.516=12.542= 1.823=0.370.4= 1.0625=78.06= 0.60.39=270.43= 1.70.45=1.21.4= 0.378.4=0.861.2= 2.340.15=212.84= 4.328=6.825= 6.56.5=5+2.6= 0.985.5=2.12.15= 5.
2、22.9= 26.40.063=小数乘法简便运算一、乘法交换律与结合律的运用。4.560.42.5 12.52.70.812.5320.25 2.53212.556 250.36二、乘法分配律的运用。12.58.8 990.353.71.82.71.895.70.286.30.280.2821.0891.08三、比较乘法结合律与分配律在简便运算时的区别。12.588 12.5880.2548 0.2548四、变一变,能简算。480.56440.48 0.2793430.657279五、小测题。51.030.2 321.250.4599 5310.10.12596 4.26.513.494.212.510112.5 (204)0.254521502.1 451.585.515.8