试题 试卷
题型:单选题 题类: 难易度:普通
【实验班提优训练】数学五年级上 第1单元自主测评卷
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)
4.73×2.5+2.5×5.27=( )
0.9×0.99=
8.5×0.8+0.5×0.8+1÷1.25
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