《2025年一遍过五年级数学上册苏教版》

用简便方法计算下面各题。
1 $4.26×52.7 + 35.2×5.27 + 0.222×527$
2 $0.9999×0.7 + 0.1111×2.7$
3 $8.5×0.16 + 4.7×0.84 + 38×0.084$
4 $2023.5×2018.5 - 2019.5×2020.5$

答案： 1 4.26×52.7+35.2×5.27+0.222×527
=4.26×52.7+3.52×52.7+2.22×52.7
=52.7×(4.26+3.52+2.22)
=52.7×10
=527
2 0.9999×0.7+0.1111×2.7
=0.9999×0.7+0.1111×9×0.3
=0.9999×0.7+0.9999×0.3
=0.9999×(0.7+0.3)
=0.9999×1
=0.9999
3 8.5×0.16+4.7×0.84+38×0.084
=8.5×0.16+4.7×0.84+3.8×0.84
=8.5×0.16+0.84×(4.7+3.8)
=8.5×0.16+0.84×8.5
=8.5×(0.16+0.84)
=8.5×1
=8.5
4 2023.5×2018.5 - 2019.5×2020.5
=2023.5×(2020.5-2)-2019.5×2020.5
=2023.5×2020.5-2023.5×2-2019.5×2020.5
=2020.5×(2023.5-2019.5)-2023.5×2
=2020.5×4-2023.5×2
=8082-4047
=4035