0.99×85.5如何简算?

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0.99×85.5如何简算?

0.99×85.5
=(1-0.01)×85.5
=1×85.5-0.01×85.5
=85.5-0.855
=84.645

0.99×85.5
=(1-0.01)×85.5
=85.5-0.855
=84.645