81.9×0.9-0.9×1.9怎么简算
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/22 13:57:03
81.9×0.9-0.9×1.9怎么简算
![81.9×0.9-0.9×1.9怎么简算](/uploads/image/z/6970829-5-9.jpg?t=81.9%C3%970.9-0.9%C3%971.9%E6%80%8E%E4%B9%88%E7%AE%80%E7%AE%97)
【简便算法①】:
81.9×0.9-0.9×1.9
=(81.9-1.9)×0.9
=80×0.9=8×9
=72
【简便算法②】:
81.9×0.9-0.9×1.9
=(80+1.9)×0.9-1.9×0.9
=80×0.9+1.9×0.9-1.9×0.9
=72
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采纳是我前进的动力~
如果您觉得满意,可以点击“采纳为满意答案”哦!
81.9×0.9-0.9×1.9
=(81.9-1.9)×0.9
=80×0.9=8×9
=72
【简便算法②】:
81.9×0.9-0.9×1.9
=(80+1.9)×0.9-1.9×0.9
=80×0.9+1.9×0.9-1.9×0.9
=72
----------------------------------------------------------------------------------------------------------------------
采纳是我前进的动力~
如果您觉得满意,可以点击“采纳为满意答案”哦!