乘法交换律和乘法结合律练习课

Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Click to edit Master title style,Click to edit Master text styles,Click to edit Master title style,Click to edit Master text styles,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,*,Click to edit Master title style,1220=,（）,12,916=,（）,9,（）,7=7N,在,(),里填上合适的数。,20,16,N,用字母表示：,a,b=b,a,（2）在,括号,里填上合适的数。,30,25,4,=30（,）,125840=（,）,25,4,125,8,40,用字母表示：,(a,b),c=a,(b,c),先填空，再想想应用了什么运算律？,4516=16,5,（,149,）,=,（,5,）,45,14,9,乘法交换律,乘法结合律,6135=13,（,）,6,5,乘法交换律、乘法结合律,4,34,5,12,11,5,2,25,10,你能很快说出每束气球上三个数连乘的积吗？,680,660,500,口算：,502=,5020=,254=,1,258=,2512=,2540=,125080,=,12516=,12524=,25,32125=,381254,421258,你能运用乘法结合律，使下列的计算简便吗？,25124,用简便算法计算,798125 8,（,25125,）,125138 251142,2548 12572,4,（,259,）,161253,思考,题：,你能很快算出它的结果吗？,25912548,=(254)(1258)9,=10010009,=900000,拓展练习：,94 5 25 2,=9,（,425,）,（,5 2,）,=9100 10,=91000,=9000,拓展练习：,94 5 25 2,=9,（,425,）,（,5 2,）,=9100 10,=91000,=9000,算一算,（,20,4,）,25,25(200,4),25,29,4,12563,8,351258,995,2,