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九年义务教育六年制小学试用课本,第八册数学,用简便方法计算,用简便方法计算,441258,=,44(1258),乘法的结合律,251384,874025,第一步应该怎么算:,9811125,=,9118125,乘法的交换律,=,(911)(8125),乘法的结合律,25114023,525420,说出计算的步骤:,(22+25)4,=,224+254,乘法的分配律,(40+8)125,6599+65,2825,=,7425,=,7(425),乘法的结合律,12524,2536,9,3,8,4,第一步应该怎么算:,1634+8434,=,34(16+84),乘法的分配律,516+524,3624+1924+4524,12927+12927+129,找出相同的乘数:,10232,=,(100+2)32,10032+232,=,以便应用结合律,75101,66301,100,1,300,1,怎样做最简便:,3412+3456+3432,13038+13061+130,(25+30)4,口述计算步骤:,12532,3519+6519,12040825,4,8,19,19,382504,382504,3412+3456+3432,13038+13061+130,(25+30)4,12532,3519+6519,12040825,
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