6.89×9.9的简便方法计算?
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把9.9拆分成10-0.1,原数学式子可以变换为:
6.89×(10-0.1)
=6.89×10-6.89×0.1
=68.9-0.689
=68.211
6.89×(10-0.1)
=6.89×10-6.89×0.1
=68.9-0.689
=68.211
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6.89×9.9
=6.89×(10-0.1)
=6.89×10-6.89×0.1
=68.9-0.689
=68.211
=6.89×(10-0.1)
=6.89×10-6.89×0.1
=68.9-0.689
=68.211
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6.89×9.9
=6.89×(10-0.1)
=68.9-0.689
=68.211
=6.89×(10-0.1)
=68.9-0.689
=68.211
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简便计算方法如下:
6.89×9.9
=6.89×(10-0.1)
=68.9-0.689
=68.211
6.89×9.9
=6.89×(10-0.1)
=68.9-0.689
=68.211
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已踩过<
评论
收起
你对这个回答的评价是?
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