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如何简算?
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0.99×85.5
=（1-0.01）×85.5
=1×85.5-0.01×85.5
=85.5-0.855
=84.645