第一种：乘法分配律的应用7411例题：1）()272）()4218271643554练习：（＋）×3.284×（－）486723131(＋－)×24()4834242第二种：乘法分配律的逆运算1111555314171）2）3）262626615368998313155573143391797练习：×＋××－××＋×91391351111510121012-1-425552727799129125165第三种：数字化加式或减式367例题：1）352）603343011120174411练习：47×2019×46×25×4820204724第四种：带分数化加式11计算：72×158-2-练习：计算下面各题：111111131462×33××6441×+51×1792021763445第五种：乘法交换律与乘法分配律的综合运用13计算：×27+×4155练习：计算下面各题：1315151×78+×27×35+×17×6+×6+×1244668882454133161×+××+×+×1791797476712-3-家庭作业35231121×35145×54××46+×2836721163313421442000×+××60+×16×98×200391191177332001152741213313×+28××2+×6+×6×6+×7+2×567913131311111151315132977×+×+××+×0.4×101-112011211545450501111137516115－×20×79+50×+×131333199179917-4-531711116681376×+×+×31371371781516152131913191431431、直接写得数。1125733×0.24=2×=×1.8=×1=56×=3456121457359414112.7×=×=×0.5=12×=3×=181810256114131125383×15=13×1=－=－=26×=51012965132、计算下面各题，能简算的要简算.214323××182.5×××0.8×357554218427（+）×2×10（+）×9×327×（×）2059271830-5-336128553（2－）××（7－2）×+×88156311991143536186575×+××－××2.4－×2.494274131313131212336321×37××24（+7）×2520352553132545521×+×－×3－×42457971425-6-16412753+××（6－）0.12×（++）2466324644131919×（125×51）（+）×7×10×299×175720208162762（48+）××76×+×0.4－2÷5×324775111111-7-