试题 试卷
题型:填空题 题类:常考题 难易度:普通
乘法的交换、结合律4861 10
5,,,20,15,30,20,40.
30-3 , 27-3 , 24-3 , {#blank#}1{#/blank#} -3 , {#blank#}2{#/blank#} -3 {#blank#}3{#/blank#}
28 ,32 ,36 ,{#blank#}1{#/blank#} ,{#blank#}2{#/blank#} ,48 ,{#blank#}3{#/blank#}.
试题篮