4.01×0.9的简便计算？
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4.01×0.9
=4.01×（1-0.1）明段
=4.01×1-4.01×0.1
=4.01-0.401
=3.609
或晌槐桥宴猛4.01×0.9
=4×0.9+0.01×0.9
=3.6+0.009
=3.609
=4.01×（1-0.1）明段
=4.01×1-4.01×0.1
=4.01-0.401
=3.609
或晌槐桥宴猛4.01×0.9
=4×0.9+0.01×0.9
=3.6+0.009
=3.609
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