《2025年黄冈小状元作业本五年级数学上册人教版重庆专版》

1. 直接写出得数。(10分)
$0.07×0.8= $ $0.17×0.03= $ $0.72÷12= $
$5.2÷13= $ $2.5×8= $ $9.6÷0.6= $
$4.8÷3= $ $0÷3.68= $
$2.33×0.2×5= $ $0.4÷0.1×0.4÷0.1= $

答案： 0.056 0.0051 0.06 0.4 20 16 1.6 0 2.33 16

2. 列竖式计算下面各题。(带※的要验算)(10分)
$3.16×0.85= $ $4.58÷1.1≈$
(得数保留两位小数)
※$10.8÷4.5= $

答案： 2.686 4.16 2.4 竖式及验算略

3. 计算下面各题,怎样简便就怎样计算。(12分)
$34.2÷0.6×0.8$ $4.66×0.28+4.66×0.72$
$0.25×1.8×0.4$ $5.7×9.8+0.57×2$

答案： 34.2÷0.6×0.8
=57×0.8
=45.6
4.66×0.28+4.66×0.72
=4.66×(0.28+0.72)
=4.66×1
=4.66
0.25×1.8×0.4
=0.25×0.4×1.8
=0.1×1.8
=0.18
5.7×9.8+0.57×2
=5.7×9.8+5.7×0.2
=5.7×(9.8+0.2)
=5.7×10
=57