如题所述
7.28*9.9+72.8
=7.28×(10-0.1)+7.28
=7.28×10-7.28×0.1+72.8
=72.8×2-0.728
=145.6-0.728
=144.872
=7.28×(10-0.1)+7.28
=7.28×10-7.28×0.1+72.8
=72.8×2-0.728
=145.6-0.728
=144.872
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第1个回答 2016-12-26
7.28×9.9+72.8
=7.28×(10-0.1)+72.8
=72.8-0.728+72.8
=72.8×2-0.728
=145.6-0.728
=144.872
=7.28×(10-0.1)+72.8
=72.8-0.728+72.8
=72.8×2-0.728
=145.6-0.728
=144.872
第2个回答 2016-12-26
题目有问题追问
有什么问题