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用简便方法计算
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综合练习 应用分配律 应用结合律 作业
应用的是什么定律 44125 8 = 44(125 8) 乘法的结合律
第一步应该怎么算: 25138 4 8740 25
应用的是什么定律 应用的是什么定律 98 11 125 = 911 8 125 = (911) ( 8 125) 乘法的结合律 乘法的交换律
说出计算的步骤: 2511 40 23 525 4 20
应用的是什么定律 (22+25)4 = 224+25 4 乘法的分配律
(40+8)125 6599 +65
为什么写成74 应用的是什么定律 2825 = 7425 = 7(4 25) 乘法的结合律
第一步应该怎么算: 12524 8 3 2536 9 4
应用的是什么定律 1634+84 34 = 34(16 +84) 乘法的分配律
找出相同的乘数: 516+5 24 3624+19 24+ 4524 12927+129 27+ 129
为什么写成100+2 以便应用结合律 10232 = (100+2)32 10032+2 32 =
怎样做最简便: 75101 100 1 66301 300 1
口述计算步骤: 3412+34 56+ 3432 13038+130 61+ 130 (25+30)4
125 32 8 4 12040 825 3519+65 19 19 19 38250 4
38250 4 3412+34 56+ 3432 13038+130 61+ 130 (25+30)4
125 32 12040 825 3519+65 19
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