81.9×0.9-0.9×1.9怎么简算

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/19 22:51:08
81.9×0.9-0.9×1.9怎么简算81.9×0.9-0.9×1.9怎么简算81.9×0.9-0.9×1.9怎么简算【简便算法①】:81.9×0.9-0.9×1.9=(81.9-1.9)×0.9=

81.9×0.9-0.9×1.9怎么简算
81.9×0.9-0.9×1.9怎么简算

81.9×0.9-0.9×1.9怎么简算
【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
----------------------------------------------------------------------------------------------------------------------
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!