试题 试卷
题型:脱式计算 题类: 难易度:困难
2022.10.29数据谷八中数学新思学第14套
47×9+72×9=(□○□)○□
①0.25×2.8
=0.25×(4×0.7)
=0.25×4×0.7
=1×0.7
=0.7
(应用了{#blank#}1{#/blank#}定律)
②51.25×0.8
=(50+1.25)×0.8
=50×0.8+1.25×0.8
=40+1
=41
(应用了{#blank#}2{#/blank#}定律)
试题篮