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857乘以1.9减8.57乘以80减85.7等于几,简便计算
人气:277 ℃ 时间:2019-08-21 20:26:51
解答
857乘以1.9减8.57乘以80减85.7
=85.7×19-52.7×8-85.7×1
=85.7×(19-8-1)
=85.7×10
=857
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